the docs lied to me you do need checkout:

Author: subdavis

.github/workflows/build.yml

@@ -14,6 +14,9 @@ jobs:
     name: Publish Docker Container
     runs-on: ubuntu-latest
     steps:
+      - 
+        name: Checkout repository
+        uses: actions/checkout@v4
       - 
         name: Set up QEMU
         uses: docker/setup-qemu-action@v3