fix(workflow): pull format (#70)

Author: fumiama

.github/workflows/black_PR.yml renamed to .github/workflows/pull_format.yml

@@ -12,16 +12,22 @@ jobs:
     continue-on-error: true
     steps:
       - uses: actions/checkout@v3
+        with:
+          ref: ${{ github.head_ref }}
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install black
+
+      - name: Install Black
         run: pip install black
-      - name: run black
+
+      - name: Run Black
         # run: black $(git ls-files '*.py')
         run: black .
-      - name: AutoCommit
+
+      - name: Commit Back
         uses: stefanzweifel/git-auto-commit-action@v4
         with:
           commit_message: Apply Code Formatter Change