ci: Build image for arm64 and amd64 architechtures (#39)

Author: sdn4z

.github/workflows/publish.yml

@@ -70,6 +70,7 @@ jobs:
           context: .
           file: ./Dockerfile
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=registry,ref=ghcr.io/elementsinteractive/lightman-ai:buildcache