fix: Checkout PR HEAD commit instead of merge commit (#72)

* update .gitignore file

* fix: Update commit-check.yml

Author: shenxianpeng

.github/workflows/commit-check.yml

@@ -10,6 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
       - uses: ./  # self test
         with:
           message: true

.gitignore

@@ -1 +1,2 @@
 venv/
+.venv/