如何使github动作矩阵元素有条件

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我有一个使用 'strategy' = 'matrix' 和要构建的特定配置列表的工作流。

链接到工作流 YAML（也在下面提供）

#
# build-N-test-v2.1-Dev and build-N-test-v2.1-Release are neary
# identical, but a few tests are commented out (to not needlessly stress CI system)
# for v2.1-Dev builds
#
# NOTE: I've tried many tricks - none which seem to work - to get this working on one file with one
# workflow and tests
#     https://github.community/t/what-is-the-correct-if-condition-syntax-for-checking-matrix-os-version/16221
#     https://github.community/t/how-to-conditionally-include-exclude-items-in-matrix-eg-based-on-branch/16853
#
# but none seem to work
#

name: build-N-test-v2.1-Dev

on:
  push:
    branches:
      - v2.1-Dev
      #- v2.1-Release
  workflow_dispatch:
    inputs:
      ignored:
        description: "ignored"
        required: false
        default: ""

## NB: JOBS section IDENTICAL between v2.1-Dev and 2.1-Release files EXCEPT that on v2.1-Dev file
## comment out all entries marked with includeInDevBranchBuilds: false
jobs:
  build-n-test-Linux:
    runs-on: ${{ matrix.runs_on }}
    strategy:
      #
      # Configuration notes
      #   o --debug-symbols false to reduce build disk size (and we aren't debugging anyhow) in many debug configurations
      #
      matrix:
        include:
          # ## SADLY: Container operations are only supported on Linux runners
          # - displayTargetName: windows-DBG
          #   os: windows
          #   compiler: g++-8
          #   runs_on: windows-latest
          #   container_image: sophistsolutionsinc/stroika-buildvm-windows-cygwin-vs2k19
          #   cpp_version: c++17
          #   config_name: Debug
          #   extra_config_args: --apply-default-debug-flags --trace2file enable

          ## centos 8
          - displayTargetName: centos-8
            os: unix
            compiler: g++
            runs_on: ubuntu-latest
            container_image: sophistsolutionsinc/stroika-buildvm-centos-8-small
            cpp_version: c++17
            config_name: Release
            extra_config_args: --apply-default-release-flags --trace2file enable
            includeInDevBranchBuilds: true

          ## ubuntu 18.04
          - displayTargetName: ubuntu-18.04-g++-8 (Debug)
            os: unix
            compiler: g++-8
            runs_on: ubuntu-latest
            container_image: sophistsolutionsinc/stroika-buildvm-ubuntu1804-regression-tests
            cpp_version: c++17
            config_name: Debug
            extra_config_args: --apply-default-debug-flags --trace2file enable --debug-symbols false
            includeInDevBranchBuilds: true

          - displayTargetName: ubuntu-18.04-cross-compile-raspberrypi (Debug)
            os: unix
            compiler: g++-8
            runs_on: ubuntu-latest
            container_image: sophistsolutionsinc/stroika-buildvm-ubuntu1804-regression-tests
            cpp_version: c++17
            config_name: Debug
            extra_config_args: --apply-default-release-flags --trace2file enable --compiler-driver arm-linux-gnueabihf-g++-8 --cross-compiling true
            includeInDevBranchBuilds: true

          # ubuntu 20.04
          # - displayTargetName: ubuntu-20.04-g++-9 (Debug)
          #   os: unix
          #   compiler: g++-9
          #   runs_on: ubuntu-latest
          #   container_image: sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests
          #   cpp_version: c++17
          #   config_name: Debug
          #   extra_config_args: --apply-default-debug-flags --trace2file enable --debug-symbols false
          #   includeInDevBranchBuilds: false

          # - displayTargetName: ubuntu-20.04-g++-10 (Debug)
          #   os: unix
          #   compiler: g++-10
          #   runs_on: ubuntu-latest
          #   container_image: sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests
          #   cpp_version: c++17
          #   config_name: Debug
          #   extra_config_args: --apply-default-debug-flags --trace2file enable --debug-symbols false
          #   includeInDevBranchBuilds: false

          - displayTargetName: ubuntu-20.04-g++-10
            os: unix
            compiler: g++-10
            runs_on: ubuntu-latest
            container_image: sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests
            cpp_version: c++17
            config_name: Release
            extra_config_args: --apply-default-release-flags --trace2file enable
            includeInDevBranchBuilds: true

          # - displayTargetName: ubuntu-20.04-g++-10-c++2a
          #   os: unix
          #   compiler: g++-10
          #   runs_on: ubuntu-latest
          #   container_image: sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests
          #   cpp_version: c++2a
          #   config_name: Release
          #   extra_config_args: --apply-default-release-flags --trace2file enable
          #   includeInDevBranchBuilds: false

          # - displayTargetName: ubuntu-20.04-clang++-10
          #   os: unix
          #   compiler: clang++-10
          #   runs_on: ubuntu-latest
          #   container_image: sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests
          #   cpp_version: c++17
          #   config_name: Release
          #   extra_config_args: --apply-default-release-flags --trace2file enable
          #   includeInDevBranchBuilds: false

    ### ATTEMPT TO COMPRESS 2 workflow files into one, but so far not working
    ### SEE
    ### https://stackoverflow.com/questions/65384420/how-to-make-a-github-action-matrix-element-conditional/65385385#65385385
    ###
    #if: github.ref == 'refs/heads/v2.1-Release' || matrix.includeInDevBranchBuilds
    env:
      # vm has 2 virtual CPUs, but 8GB ram, so jobs=5 (empirical), and QUICK_BUILD avoids some internal testing
      MAKEFLAGS: "--jobs=3 QUICK_BUILD=1"
    container: ${{ matrix.container_image }}
    steps:
      - uses: actions/checkout@v2
      - name: Build System Info
        if: ${{ matrix.os=='unix' }}
        run: |
          lsb_release -d 2>/dev/null || true
          echo "CWD=" `pwd`
          echo "nproc=" `nproc`
          grep "model name" /proc/cpuinfo | head -1
          grep processor /proc/cpuinfo | wc -l
          grep MemTotal /proc/meminfo
          df -h
      - name: Build System Info (Windows)
        if: ${{ matrix.os=='windows' }}
        run: |
          echo "CWD=" `pwd`
          df -h
      - name: Configure ${{ matrix.config_name }}
        run: |
          ./configure ${{ matrix.config_name }} --compiler-driver ${{ matrix.compiler }} ${{ matrix.extra_config_args }} --cppstd-version ${{ matrix.cpp_version }}
          cat ConfigurationFiles/${{ matrix.config_name }}.xml
      # Break out third-party-components to do clean so we dont run out of disk space, and break out TPC AND library
      # to show the summary time for each part
      - name: Make third-party-components
        run: |
          make third-party-components
          make clean
      - name: Make libraries
        run: make libraries
      - name: Make all
        run: make all
      - name: Run Tests
        run: make run-tests
      - name: Archive Samples Results
        uses: actions/upload-artifact@v2
        with:
          name: Sample apps (${{ matrix.displayTargetName }})
          path: |
            Builds/${{ matrix.config_name }}/Samples-*
      - name: Archive Log Results
        uses: actions/upload-artifact@v2
        with:
          name: Log Data (${{ matrix.displayTargetName }})
          path: |
            Builds/${{ matrix.config_name }}/PerformanceDump.txt
            /tmp/Trace*.txt

  build-n-test-MacOS:
    runs-on: ${{ matrix.runs_on }}
    strategy:
      matrix:
        # Add to extra_config_args for build speed: --Xerces no --OpenSSL no --lzma no --boost no
        include:
          - displayTargetName: MacOS-Debug
            os: macos-10.15
            runs_on: macos-10.15
            config_name: Debug
            extra_config_args: --apply-default-debug-flags --trace2file enable
            includeInDevBranchBuilds: true
          # - displayTargetName: MacOS
          #   os: macos-10.15
          #   runs_on: macos-10.15
          #   config_name: Release
          #   extra_config_args: --apply-default-release-flags --trace2file enable
          #   includeInDevBranchBuilds: false
    env:
      # vm has 2 virtual CPUs, but 8GB ram, so jobs=5 (empirical), and QUICK_BUILD avoids some internal testing
      MAKEFLAGS: "--jobs=3 QUICK_BUILD=1"
    steps:
      - uses: actions/checkout@v2
      - name: Build System Info
        run: |
          echo "CWD: `pwd`"
          df -h
          system_profiler SPSoftwareDataType
          sw_vers
      # If we had docker ability, most of these would be built into a docker file
      - name: Install Basic Build requirements
        run: |
          brew install gnu-sed
          brew install p7zip
          brew install automake
          make install-realpath
      - name: Configure
        run: |
          ./configure ${{ matrix.config_name }} ${{ matrix.extra_config_args }}
          cat ConfigurationFiles/${{ matrix.config_name }}.xml
      - name: Build third-party-components
        run: |
          make third-party-components
          make clean
      - name: Build Library
        run: |
          make libraries
      - name: Build All
        run: |
          make all
      - name: Run-Tests
        run: |
          make run-tests
      - name: Workaround GitHub-Actions-MacOS Issue with env.TMPDIR
        run: |
          mkdir /tmp/LOGS-ARCHIVE
          cp $TMPDIR/Trace*.txt /tmp/LOGS-ARCHIVE
      - name: DEBUG Workaround GitHub-Actions-MacOS Issue with env.TMPDIR
        run: |
          echo "TMPDIR=$TMPDIR"
          echo "TMPDIR using ENV.TMPDIR=${{ env.TMPDIR }}"
          # Just the echo line above shows empty, and then the ls line causes exit 1/failure
          #ls -l ${{ env.TMPDIR }}/Trace*.txt
          #if this gets fixed, then lose Workaround GitHub-Actions-MacOS, and directly reference ${{ env.TMPDIR }}/Trace*.txt in Archive Log Results
      - name: Build System Info
        run: |
          df -h
      - name: Archive Log Results
        uses: actions/upload-artifact@v2
        with:
          name: Log Results (${{ matrix.displayTargetName }})
          path: |
            Builds/${{ matrix.config_name }}/PerformanceDump.txt
            /tmp/LOGS-ARCHIVE
            #${{ env.TMPDIR }}/Trace*.txt
      - name: Archive Sample Results
        uses: actions/upload-artifact@v2
        with:
          name: Samples (${{ matrix.displayTargetName }})
          path: |
            Builds/${{ matrix.config_name }}/Samples-*

  build-n-test-Windows:
    runs-on: ${{ matrix.runs_on }}
    strategy:
      matrix:
        # Add to extra_config_args for build speed: --Xerces no --OpenSSL no --lzma no --boost no
        include:
          - displayTargetName: windows-x86-Debug
            os: windows
            runs_on: windows-latest
            container_image: sophistsolutionsinc/stroika-buildvm-windows-cygwin-vs2k19
            config_name: Debug
            extra_config_args: --arch x86 --apply-default-debug-flags --trace2file enable
            includeInDevBranchBuilds: true
          # - displayTargetName: windows-x86-Release
          #   os: windows
          #   runs_on: windows-latest
          #   container_image: sophistsolutionsinc/stroika-buildvm-windows-cygwin-vs2k19
          #   config_name: Release
          #   extra_config_args: --arch x86 --apply-default-release-flags --trace2file enable
          #   includeInDevBranchBuilds: false
          # - displayTargetName: windows-x86_64-Debug
          #   os: windows
          #   runs_on: windows-latest
          #   container_image: sophistsolutionsinc/stroika-buildvm-windows-cygwin-vs2k19
          #   config_name: Debug
          #   extra_config_args: --arch x86_64 --apply-default-debug-flags --trace2file enable
          #   includeInDevBranchBuilds: false
          # - displayTargetName: windows-x86_64-Release
          #   os: windows
          #   runs_on: windows-latest
          #   container_image: sophistsolutionsinc/stroika-buildvm-windows-cygwin-vs2k19
          #   config_name: Release
          #   extra_config_args: --arch x86 --apply-default-release-flags --trace2file enable
          #   includeInDevBranchBuilds: false
    env:
      # vm has 2 virtual CPUs, but 8GB ram, so jobs=5 (empirical), and QUICK_BUILD avoids some internal testing
      MAKEFLAGS: "--jobs=3 QUICK_BUILD=1"
      ARTIFACTS_DIR: "c:/Artifacts/"
    steps:
      - uses: actions/checkout@v2
      # https://stackoverflow.com/questions/58033366/how-to-get-current-branch-within-github-actions
      - name: Extract branch name
        shell: bash
        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
        id: extract_branch
      - name: Build System Info
        shell: "bash"
        run: |
          echo "CWD: `pwd`"
          df -h
          systeminfo
          echo NUMBER_OF_PROCESSORS=$NUMBER_OF_PROCESSORS
      - name: docker pull ${{ matrix.container_image }}
        run: docker pull ${{ matrix.container_image }}
      - name: Start docker build environment
        run: |
          docker run --tty --memory 5G --cpus 2 --storage-opt 'size=50GB' --detach --name buildContainer ${{ matrix.container_image }}
      - name: Print Info about docker system
        shell: "bash"
        run: |
          docker ps -a
          docker exec buildContainer systeminfo
          docker exec buildContainer df -h
      - name: Git Checkout
        shell: "bash"
        run: |
          docker exec buildContainer sh -c "git clone https://github.com/SophistSolutions/Stroika.git && cd Stroika && git checkout ${{ steps.extract_branch.outputs.branch }}"
      - name: Configure
        shell: "bash"
        run: |
          docker exec --workdir c:/Stroika buildContainer sh -c "./configure ${{ matrix.config_name }} ${{ matrix.extra_config_args }}"
          docker exec --workdir c:/Stroika buildContainer cat ConfigurationFiles/${{ matrix.config_name }}.xml
      - name: Build
        shell: "bash"
        run: |
          docker exec --workdir c:/Stroika --env MAKEFLAGS="$MAKEFLAGS" buildContainer make all
      - name: Run-Tests
        shell: "bash"
        run: |
          docker exec --workdir c:/Stroika --env MAKEFLAGS="$MAKEFLAGS" buildContainer make run-tests
      - name: Build System Info
        shell: "bash"
        run: |
          df -h
          docker exec buildContainer df -h
      - name: Copy Build Artifacts
        shell: "bash"
        # due to flaws in docker (windows must stop) - and cp no wildcards
        run: |
          docker exec --workdir c:/Stroika buildContainer bash -c 'mkdir TRACE_LOGS && cp $TEMP/Trace*.txt TRACE_LOGS/'
          docker stop buildContainer
          docker cp buildContainer:Stroika/Builds/${{ matrix.config_name }}/ $ARTIFACTS_DIR 2> /dev/null
          docker cp buildContainer:Stroika/TRACE_LOGS $ARTIFACTS_DIR 2> /dev/null
          rm -rf $ARTIFACTS_DIR/{ThirdPartyComponents,Tests,*.lib}
      - name: Archive Log Results
        uses: actions/upload-artifact@v2
        with:
          name: Log Results (${{ matrix.displayTargetName }})
          path: |
            ${{ env.ARTIFACTS_DIR }}PerformanceDump.txt
            ${{ env.ARTIFACTS_DIR }}TRACE_LOGS
      - name: Archive Sample Results
        uses: actions/upload-artifact@v2
        with:
          name: Samples (${{ matrix.displayTargetName }})
          path: |
            ${{ env.ARTIFACTS_DIR }}Samples-*

但是我只想在分支 = v2.1-Release 时才构建一些配置。也就是说 - 在大多数情况下 - 只构建一两个配置，但在发布时构建更多配置。

我通过克隆脚本（工作流程）并重命名一些内容并注释掉这些内容来完成此操作。但如果该机制与矩阵元素一起工作，那就太好了。

我意识到有一个“if”功能可以添加到每个步骤，但这会创建大量带有禁用步骤的工作。我想要的是，根本不为每个具有 if 部分评估为 false 的矩阵元素启动这些工作。

回答

TLDR：您可以通过过滤要在先前构建作业/步骤中使用的配置，并使用该过滤的结果作为作业中的矩阵值，用一个工作流程做您想做的事情build-n-test。

更长的版本：

您可以创建一个job（即build-n-test），其中 的值strategy.matrix根据某些标准而不同，方法是将 的值设置为先前作业strategy.matrix的反序列output化（即matrix_prep）。以前的工作将负责matrix根据您的自定义标准构建值。以下 yaml 演示了这一点（稍后包含了一个副本，并添加了注释以进行解释）：

name: Configurable Build Matrix

on: push
jobs:
  matrix_prep:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
    - name: Check out code into the Go module directory
      uses: actions/checkout@v2
    - id: set-matrix
      run: |
        branchName=$(echo '${{ github.ref }}' | sed 's,refs/heads/,,g')  
        matrix=$(jq --arg branchName "$branchName" 'map(. | select((.runOn==$branchName) or (.runOn=="always")) )' matrix_includes.json)                
        echo ::set-output name=matrix::{"include":$(echo $matrix)}"
  build-n-test:
    needs: matrix_prep
    runs-on: ${{ matrix.runs_on }}
    strategy:
      matrix: ${{fromJson(needs.matrix_prep.outputs.matrix)}}
    steps:    
    - run: echo "Hello ${{ matrix.someValue }}"

matrix_includes.jsonset-matrix 任务中使用的文件的内容可以在本段之后找到。要查看问题中的矩阵配置作为 JSON 的样子，请查看此答案的底部附近。我选择了将 JSON 文件与工作流定义本身分开的路线，因为我发现在工作流本身中包含原始 JSON 非常混乱（尤其是当 JSON 文件很大时）。

[
    {
        "runs_on":"ubuntu-16.04",
        "someValue":"Foo",
        "runOn":"always"
    },
    {
        "runs_on":"ubuntu-18.04",
        "someValue":"Bar",
        "runOn":"v2.1-Release"
    },
    {
        "runs_on":"ubuntu-20.04",
        "someValue":"Hello again",
        "runOn":"v2.1-Release"
    }
]

使用上面的设置，所有构建都将包含一个配置，只有当分支名称匹配v2.1-Release 时才会包含两个配置。通过对工作流文件中的sed和jq选项进行一些调整，分支名称限制可以放宽，以便您可以为所有包含的分支-Release（而不是仅针对单个分支）运行配置。如果有兴趣，我可能会将其包含在此答案中（因为它不一定与您当前的问题相符）。

set-matrix 职位说明

就set-matrix任务而言，请参考以下说明：

# ${{ github.ref }} returns the full git ref. As such, 'refs/heads/` should be stripped for easier future use
branchName=$(echo '${{ github.ref }}' | sed 's,refs/heads/,,g')  
# Use jq to read in a json file that represents the matrix configuration. Each block has a 'runOn' property. 
# The jq filter is setup to only output items that are set to 'always' or that have a branch name that matches 
# the current branch.
matrix=$(jq --arg branchName "$branchName" 'map(. | select((.runOn==$branchName) or (.runOn=="always")) )' matrix_includes.json)        
# This 'echo' uses a special syntax so that the output of this job is set correctly
echo ::set-output name=matrix::{"include":$(echo $matrix)}"

工作流程说明

以下 yaml 内容应与上述内容相同，并附加一些注释以帮助解释：

name: Configurable Build Matrix

on: push
jobs:
  matrix_prep:
    # Using a separate job and agent so as to be able to use tools like 'sed' and 'jq'
    runs-on: ubuntu-latest
    # Defining outputs of a job allows for easier consumption and use
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
    # Checking out code as the set-matrix step utilizes a file named matrix_includes.json
    - name: Check out code into the Go module directory
      uses: actions/checkout@v2
    # This step is explained more in a following section
    - id: set-matrix
      run: |
        branchName=$(echo '${{ github.ref }}' | sed 's,refs/heads/,,g')  
        matrix=$(jq --arg branchName "$branchName" 'map(. | select((.runOn==$branchName) or (.runOn=="always")) )' matrix_includes.json)                
        echo ::set-output name=matrix::{"include":$(echo $matrix)}"
  build-n-test:
    # By stating 'needs' here, the output of 'matrix_prep' is available to this job
    needs: matrix_prep
    runs-on: ${{ matrix.runs_on }}
    strategy:
      # We need to convert the json string output into an object that the GitHub Workflow expects.
      # Thankfully, the json-schema for Workflows allows 'matrix' to be set to an expression.
      matrix: ${{fromJson(needs.matrix_prep.outputs.matrix)}}
    steps:
    # Output a configuration specific value as proof and as a sanity check
    - run: echo "Hello ${{ matrix.someValue }}"

示范

我为这个演示整理了两个文件：

  • 所述工作流定义（下面粘贴）
  • 一个包含矩阵信息的 JSON 文件（粘贴在下面）

以下两个屏幕截图来自使用相同工作流定义在不同分支上的运行。请注意，两者的 build-n-test Job 数量不同：

为主分支构建

为 v2.1-Release 分支构建

这是因为第一个构建发生在main分支上，第二个构建发生在分支上v2.1-Release。从matrix_includes.json上面包含的文件可以看出，这是意料之中的，因为两个配置设置为仅在分支为 时运行v2.1-Release，并且只有一个配置设置为始终运行。

更多细节

矩阵配置过滤

过滤是通过使用jq从 json 数组中选择对象来完成的，这些对象的runOn值设置为always或匹配当前branchName. 这是我之前提到的对您的逻辑的轻微调整：而不是说includeInDevBranchBuilds，我正在使用runOn它，因为它似乎对这个特定示例更有效。

分店名称

该set-matrix步骤使用从上一行设置的值：branchName=$(echo '${{ github.ref }}' | sed 's,refs/heads/.*-,,g')。该行将从refs/heads/分支 ref 中剥离并将结果存储在 value 中branchName。例如，如果您的分支是2.1-Release，branchName则将设置为2.1-Release，并且之前的过滤器将匹配具有"runOn":"2.1-Release" 或 的 任何对象"runOn":"always"。

JSON 文件

创建 JSON 文件是为了模拟您链接的工作流中的语句内容includes。使用 JSON 是因为 GitHub Actions 具有内置的 JSON 函数。作为示例，以下是我将您的matrix:include部分转换为 JSON 的看法。请注意，我已更改includeInDevBranchBuilds为runOn，并将值设置为always或v2.1-Release。

[
   {
      "displayTargetName": "centos-8",
      "os": "unix",
      "compiler": "g++",
      "runs_on": "ubuntu-latest",
      "container_image": "sophistsolutionsinc/stroika-buildvm-centos-8-small",
      "cpp_version": "c++17",
      "config_name": "Release",
      "extra_config_args": "--apply-default-release-flags --trace2file enable",
      "runOn": "always"
   },
   {
      "displayTargetName": "ubuntu-18.04-g++-8 (Debug)",
      "os": "unix",
      "compiler": "g++-8",
      "runs_on": "ubuntu-latest",
      "container_image": "sophistsolutionsinc/stroika-buildvm-ubuntu1804-regression-tests",
      "cpp_version": "c++17",
      "config_name": "Debug",
      "extra_config_args": "--apply-default-debug-flags --trace2file enable",
      "runOn": "always"
   },
   {
      "displayTargetName": "ubuntu-20.04-g++-9 (Debug)",
      "os": "unix",
      "compiler": "g++-9",
      "runs_on": "ubuntu-latest",
      "container_image": "sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests",
      "cpp_version": "c++17",
      "config_name": "Debug",
      "extra_config_args": "--apply-default-debug-flags --trace2file enable",
      "runOn": "v2.1-Release"
   },
   {
      "displayTargetName": "ubuntu-20.04-g++-10 (Debug)",
      "os": "unix",
      "compiler": "g++-10",
      "runs_on": "ubuntu-latest",
      "container_image": "sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests",
      "cpp_version": "c++17",
      "config_name": "Debug",
      "extra_config_args": "--apply-default-debug-flags --trace2file enable",
      "runOn": "v2.1-Release"
   },
   {
      "displayTargetName": "ubuntu-20.04-g++-10",
      "os": "unix",
      "compiler": "g++-10",
      "runs_on": "ubuntu-latest",
      "container_image": "sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests",
      "cpp_version": "c++17",
      "config_name": "Release",
      "extra_config_args": "--apply-default-release-flags --trace2file enable",
      "runOn": "always"
   },
   {
      "displayTargetName": "ubuntu-20.04-g++-10-c++2a",
      "os": "unix",
      "compiler": "g++-10",
      "runs_on": "ubuntu-latest",
      "container_image": "sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests",
      "cpp_version": "c++2a",
      "config_name": "Release",
      "extra_config_args": "--apply-default-release-flags --trace2file enable",
      "runOn": "v2.1-Release"
   },
   {
      "displayTargetName": "ubuntu-20.04-clang++-10",
      "os": "unix",
      "compiler": "clang++-10",
      "runs_on": "ubuntu-latest",
      "container_image": "sophistsolutionsinc/stroika-buildvm-ubuntu2004-regression-tests",
      "cpp_version": "c++17",
      "config_name": "Release",
      "extra_config_args": "--apply-default-release-flags --trace2file enable",
      "runOn": "v2.1-Release"
   }
]

以上是如何使github动作矩阵元素有条件的全部内容。
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