Update format.yml

.github/workflows/format.yml

@@ -13,6 +13,10 @@ jobs:
       # added or changed files to the repository.
       contents: write
     steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+    
       - name: Setup Biome CLI
         uses: biomejs/setup-biome@v2