Add name and multi-arch build

.github/workflows/docker.yaml

@@ -1,3 +1,5 @@
+name: release-docker-image
+
 on:
   release:
     types: [created]
@@ -12,6 +14,7 @@ jobs:
         uses: redhat-actions/buildah-build@v2
         with:
           image: planka
+          archs: linux/amd64, linux/arm/v7, linux/arm64
           tags: ${{ github.event.release.tag_name }} latest
           containerfiles: |
             ./Dockerfile
@@ -23,4 +26,4 @@ jobs:
           tags: ${{ steps.build-image.outputs.tags }} latest
           registry: ghcr.io/plankanban
           username: planka
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.GITHUB_TOKEN }}