ci: checkout when publish

Author: jef

.github/workflows/publish.yaml

@@ -8,6 +8,8 @@ jobs:
     name: Create release
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v2
         with: