implement multi arch build

Signed-off-by: Markus Blaschke <[email protected]>

Author: mblaschke

.github/workflows/release-docker.yml

@@ -45,7 +45,7 @@ jobs:
       with:
         context: .
         file: ./Dockerfile
-        platforms: linux/amd64
+        platforms: linux/amd64,linux/arm64
         push: ${{ github.event_name != 'pull_request' }}
         tags: ${{ steps.docker_meta.outputs.tags }}
         labels: ${{ steps.docker_meta.outputs.labels }}