Fix multi-arch package tagging

.github/workflows/publish.yml

@@ -68,12 +68,6 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        platform:
-          - linux/amd64
-          - linux/arm64/v8
-
     permissions:
       contents: read
       packages: write
@@ -115,6 +109,9 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          platforms: ${{ matrix.platform }}
+          platforms: linux/amd64,linux/arm64/v8
           cache-from: type=gha
           cache-to: type=gha,mode=max
+          provenance: false
+          # https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry#adding-a-description-to-multi-arch-images
+          outputs: type=image,name=target,annotation-index.org.opencontainers.image.description=A multi-arch Docker image for the Maybe Rails app