fix: ensure HEAD ref for git push

.github/workflows/lint.yml

@@ -1,11 +1,6 @@
 name: Lint-check + Style-normalize Python files
 
 on:
-  push:
-    branches: [ main ]
-    paths:
-      - '.github/workflows/lint.yml'
-      - '**.py'
   pull_request:
     paths:
       - '.github/workflows/lint.yml'
@@ -23,6 +18,7 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: '3.10'
+        ref: ${{ github.event.pull_request.head.ref }}
     - name: Lint with flake8 and Reformat with black
       run: |
         make init-lint-and-black
@@ -32,6 +28,5 @@ jobs:
       run: |
         git config user.name github-actions
         git config user.email [email protected]
-        git config push.autoSetupRemote true
         if git status --short | grep -q '\.py$'; then git add '*.py' && git commit -m "style: reformat" && git push; fi