Meta: Checkout repo in publish-pr workflow

Author: gibson042

.github/workflows/publish-pr.yml

@@ -15,6 +15,7 @@ jobs:
         github.event.workflow_run.conclusion == 'success'
       }}
     steps:
+    - uses: actions/checkout@v4
     - name: Print event info
       uses: actions/github-script@v7
       with: