Fix image labels not appearing in multi-arch images from GitHub action builds

Author: codedmonkey

.github/workflows/images-publish.yaml

@@ -39,6 +39,10 @@ jobs:
             type=schedule,pattern=nightly
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
+          labels: |
+            org.opencontainers.image.source=https://github.com/codedmonkey/dirigent
+            org.opencontainers.image.description=Dirigent PHP Package Registry
+            org.opencontainers.image.licenses=FSL-1.1-MIT
 
       - name: Login to GitHub Packages
         uses: docker/login-action@v3