ci: fix format

.github/workflows/format.yml

@@ -18,6 +18,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          ref: ${{ github.head_ref || github.ref }}
 
       - name: Setup Bun
         uses: ./.github/actions/setup-bun