Add information how to properly set up checked-out code with GO... env variables

Most basic setup with the following steps:

- uses: actions/checkout@v2
...
- uses: actions/setup-go@v2

will fail during dep ensure or go test ./... :

/home/runner/work/myproject/myproject is not within a known GOPATH/src

I must admit that with a little bit of searching I couldn’t easily configure it. Currently it starts with empty directories:

/home/runner/go
/home/runner/go/bin

The code after checkout is in:

/home/runner/work/REPOSITORY/REPOSITORY

It would be worth adding some instructions on how to modify the “checkout” step or how to set environment variables or what shell commands to execute to make it all work.

[januszm]

I got it to work with this yml:

env:
  GOPATH: ${{ github.workspace }}
  GOBIN: ${{ github.workspace }}/bin
defaults:
  run:
    working-directory: ${{ env.GOPATH }}/src/myproject
steps:
  - uses: actions/checkout@v2
    with:
      fetch-depth: 1
      path: ${{ env.GOPATH }}/src/myproject
  - name: Set up Go
    uses: actions/setup-go@v2
    with:
      go-version: ...

The key was to set this: “working-directory: ${{ env.GOPATH }}/src/myproject” and be consistent. An equivalent of Travis’s go_import_path is to define path: ${{ env.GOPATH }}/src/myproject for checkout and working-directory

[longwuyuan]

my problem turned out to be unique for the codebase in question https://github.com/kubernetes/kube-openapi/issues/225