name: 'Setup golang with master only caching'
description: 'A composite action that installs golang, but with a caching strategy that only updates the cache on master branch.'
runs:
  using: 'composite'
  steps:
    - uses: actions/setup-go@v5
      with:
        go-version-file: 'go.mod'  # Just use whatever version is in the go.mod file
        cache: ${{ github.ref == 'refs/heads/master' }}

    - name: Prepare for go cache
      if: ${{ github.ref != 'refs/heads/master' }}
      shell: bash
      run: |
        echo "GO_CACHE=$(go env GOCACHE)" | tee -a "$GITHUB_ENV"
        echo "GO_MODCACHE=$(go env GOMODCACHE)" | tee -a "$GITHUB_ENV"
        echo "GO_VERSION=$(go env GOVERSION | tr -d 'go')" | tee -a "$GITHUB_ENV"

    - name: Setup read-only cache
      if: ${{ github.ref != 'refs/heads/master' }}
      uses: actions/cache/restore@v4
      with:
        path: |
          ${{ env.GO_MODCACHE }}
          ${{ env.GO_CACHE }}
        key: setup-go-${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ hashFiles('go.sum') }}
        restore-keys: |
          setup-go-${{ runner.os }}-