Automatic multi-arch build and publication on DockerHub

.github/dependabot.yml

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+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/Multi-arch-automatic-build.yml

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+name: Multi-arch-automatic-build
+
+on:
+  # Triggers the workflow, remove the triggers you don't like/want
+  #schedule:
+    # * is a special character in YAML so you have to quote this string
+    #- cron:  '0 0 * * *'
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch: # This one is if you want to manually trigger in the Actions tab, useful to see if it works as intended
+
+jobs:
+  buildandpush:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: 'main' # branch, I think you can remove it
+
+      # https://github.com/docker/setup-qemu-action#usage
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      # https://github.com/marketplace/actions/docker-setup-buildx
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      # https://github.com/docker/login-action#docker-hub
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      # https://github.com/docker/build-push-action#multi-platform-image
+      - name: Build and push hound
+        uses: docker/build-push-action@v2
+        with:
+          context: ./web
+          file: ./web/Dockerfile
+          #platforms: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x
+          platforms: linux/amd64,linux/arm/v7,linux/arm64 # you can write just "all" if you prefer
+          pull: true
+          push: true
+          tags: |
+            mcay23/hound:latest