Make it multi arch

Author: williamdes

.github/workflows/publish.yml

@@ -27,6 +27,7 @@ jobs:
           run: make docker-build
           env:
             IMAGE_TAG: "docker.io/botsudo/action-docker-compose:latest"
+            PLATFORM: linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7
 
         - name: Sign and push docker image
           uses: sudo-bot/action-docker-sign@latest