Add formatting check to GitHub Actions

.github/workflows/ci.yaml

@@ -22,6 +22,13 @@ jobs:
         go install golang.org/x/lint/golint@latest
     - name: Checkout code
       uses: actions/checkout@v3
+    - name: Check Formatting
+      run: |
+        if [ "$(gofmt -s -l . | wc -l)" -gt 0 ]; then
+          echo "### Go formatting is off, please execute 'gofmt -w -s .' - see following diff: ###\n"
+          gofmt -s -d .
+          exit 1
+        fi
     - name: Test Project
       run: |
         make test