ci: remove explicit 'GOPATH' and add note about '-C' option

The 'git-bundle-server' repository is checked out to 'src/git-bundle-server'
in anticipation of future dependencies (e.g., Git) being checked out to
parallel 'src' directories for use in integration tests.

The initial implementation of this workflow included explicit specification
of the 'GOPATH' for both 'go build' and 'go vet'; this is not necessary, so
remove it. Additionally, add a note about how the upcoming '-C' option
should remove the need for an explicit '-C' in each build step.

Signed-off-by: Victoria Dye <[email protected]>

Author: vdye

.github/workflows/main.yml

@@ -16,16 +16,18 @@ jobs:
         with:
           path: src/git-bundle-server
 
+      # TODO: when the '-C' option is available, remove the 'cd ...'
+      # See https://github.com/golang/go/issues/50332 for more details
       - name: Build
         run: |
           cd $GITHUB_WORKSPACE/src/git-bundle-server
-          GOPATH="$GITHUB_WORKSPACE/../../" go build ./cmd/git-bundle-server
-          GOPATH="$GITHUB_WORKSPACE/../../" go build ./cmd/git-bundle-web-server
+          go build ./cmd/git-bundle-server
+          go build ./cmd/git-bundle-web-server
 
       - name: Check style
         run: |
           cd $GITHUB_WORKSPACE/src/git-bundle-server
-          GOPATH="$GITHUB_WORKSPACE/../../" go vet ./cmd/git-bundle-server
-          GOPATH="$GITHUB_WORKSPACE/../../" go vet ./cmd/git-bundle-web-server
+          go vet ./cmd/git-bundle-server
+          go vet ./cmd/git-bundle-web-server
 
       # TODO: add automated tests.