ci: run Makefile targets

Rather than invoke 'go' directly, call the appropriate Makefile targets for
the given operations in 'main.yml'. This more accurately reflects the build
process for users and CD and avoids having multiple "sources of truth" on
how to build the project.

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

Author: vdye

.github/workflows/main.yml

@@ -16,19 +16,11 @@ jobs:
         with:
           go-version-file: 'src/git-bundle-server/go.mod'
 
-      # 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
-          go build -v ./...
+        run: make -C src/git-bundle-server build
 
       - name: Check style
-        run: |
-          cd $GITHUB_WORKSPACE/src/git-bundle-server
-          go vet ./...
+        run: make -C src/git-bundle-server vet
 
       - name: Run unit tests
-        run:  |
-          cd $GITHUB_WORKSPACE/src/git-bundle-server
-          go test -v ./...
+        run: make -C src/git-bundle-server test