fix: update CI workflow for format checking

- Format check now only runs on pull requests
- Comments on PR with unformatted files and tags author
- Removes auto-commit behavior that conflicted with branch protection
- Main branch pushes only run build/test jobs

Author: maniac-en

.github/workflows/ci-cd.yml

@@ -43,34 +43,46 @@ jobs:
           name: coverage-report
           path: coverage.out
 
-  format:
-    name: Auto-format with gofmt (Linux only)
+  format-check:
+    name: Go Format Check
     runs-on: ubuntu-latest
-    if: github.event_name == 'push' && github.actor != 'github-actions[bot]'
+    if: github.event_name == 'pull_request'
     permissions:
-      contents: write
+      contents: read
+      pull-requests: write
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
           go-version: '1.24.4'
 
-      - name: Run gofmt and commit changes if needed
+      - name: Check Go formatting and comment on PR
         run: |
-          gofmt -w .
-          if [ -n "$(git status --porcelain)" ]; then
-            echo "Code was not formatted. Committing changes..."
-            git config user.name "github-actions[bot]"
-            git config user.email "github-actions[bot]@users.noreply.github.com"
-            git add .
-            git commit -m "chore: auto-format Go code via gofmt"
-            git push
+          unformatted=$(gofmt -l .)
+          if [ -n "$unformatted" ]; then
+            echo "The following files need formatting:"
+            echo "$unformatted"
+            
+            # Get PR author
+            pr_author="${{ github.event.pull_request.user.login }}"
+            
+            # Create PR comment
+            comment_body="@$pr_author Go formatting is required for the following files:
+
+\`\`\`
+$unformatted
+\`\`\`
+
+Please run \`go fmt ./...\` to format your code and push the changes."
+
+            gh pr comment ${{ github.event.number }} --body "$comment_body"
+            exit 1
           else
-            echo "Code already properly formatted."
+            echo "All Go code is properly formatted"
           fi
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}