Try supplying repository.

Author: desrosj

.github/workflows/reusable-check-built-files.yml

@@ -83,7 +83,8 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
-          ref: ${{ github.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.pull_request.head.ref }}
           show-progress: ${{ runner.debug == '1' && 'true' || 'false' }}
           token: ${{ env.ACCESS_TOKEN }}