fix: checkout PR branch ref to allow git push from CI

Author: snomiao

.github/workflows/test.yaml

@@ -12,6 +12,8 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
       # setup comfy-cli
       - uses: actions/setup-python@v5
         with: