Fix checkout

Signed-off-by: Jing Chen <[email protected]>

Author: jgchn

.github/workflows/run-examples-prep.yml

@@ -15,6 +15,7 @@ jobs:
     - uses: actions/checkout@v4
       with:
         ref: ${{ github.head_ref }}
+        repository: ${{ github.repository }}
         fetch-depth: 0
 
     # Detect modified PDL files, includes Add, Modified, but not Deleted