如何在子文件夹中使用go.mod构建golangdocker镜像？

我有一个 go 项目文件夹

my_project
|- common
    |- library
        |- golang
|- my_app
    |- Dockerfile
    |- go.mod
    |- go.sum
    |- main.go

Dockerfile 来自谷歌云官方示例：

FROM golang:1.15-buster as builder

WORKDIR /app

COPY go.* ./
RUN go mod download

COPY . ./

RUN go build -mod=readonly -v -o server

FROM debian:buster-slim
RUN set -x && apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y 
    ca-certificates && 
    rm -rf /var/lib/apt/lists/*

COPY --from=builder /app/server /server

CMD ["/server"]
    

go.mod 在同一个项目中使用公共库但属于私有存储库：

module run

go 1.15

require (
    github.com/my/private/my_project/common/library/golang v0.0.0-00010101000000-000000000000
)

replace (
    github.com/my/private/my_project/common/library/golang => ../common/library/golang
)

当我在my_app路径下运行 docker build以构建映像时，出现此错误：

...
 => ERROR [builder 4/6] RUN go mod download                                                                                                                                                                  1.0s
------
 > [builder 4/6] RUN go mod download:
#13 0.934 go: github.com/my/private/my_project/golang@v0.0.0-00010101000000-000000000000: parsing /common/library/golang/go.mod: open /common/library/golang/go.mod: no such file or directory
------
executor failed running [/bin/sh -c go mod download]: exit code: 1

为什么go.mod在当前路径中找不到文件而是使用/common/library/golang/go.mod？

回答