Avoid downloading artifact on pull-request

Author: rffontenelle

.github/workflows/sync.yml

@@ -127,6 +127,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Checkout this repository ${{ env.PYDOC_VERSION }}
+        if: ${{ contains(fromJSON('["schedule", "workflow_dispatch"]'), github.event_name) }}
         uses: actions/checkout@v6
         with:
           ref: ${{ env.PYDOC_VERSION }}