Add multi-arch docker build test

.github/workflows/docker-build.yaml

@@ -0,0 +1,25 @@
+name: build
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform: [linux/amd64, linux/arm/v7, linux/arm64]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build
+        uses: docker/build-push-action@v3
+        with:
+          platforms: ${{ matrix.platform }}
+          push: false
+          tags: |
+            maxwinterstein/toogoodtogo-ha-mqtt-bridge:build-${{ matrix.platform }}