Checkout the correct ref

Author: sebromero

Diff for: .github/workflows/render-registry.yml

@@ -8,6 +8,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.ref }}
       - uses: actions/setup-node@v2
         with:
           node-version: 14