Add GitHub actions workflow to automaticall build and push Docker ima…

…ges (#179)

* Add support for Mosquitto version >=2.x and arm

* Hopefully fix ARMv6 build

* Add disclaimer regarding tests on hardware

* Add github actions workflow to build Docker images

.github/workflows/build_and_push_docker_images.yml

@@ -0,0 +1,98 @@
+name: Build docker images and publish to DockerHub
+
+on:
+  push:
+  release:
+    types: [published]
+env:
+  MOSQUITTO_VERSION_1: 1.6.14
+  MOSQUITTO_VERSION_2: 2.0.9
+  MOSQUITTO_VERSION_SUFFIX: -mosquitto_
+  DOCKERFILE_MOSQUITTO_VERSION: 1.6.14
+  DOCKERHUB_REPO: mosquitto-go-auth
+jobs:
+  mosq_1:
+    name: Build and publish with Mosquitto version 1.x
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      - 
+        name: Set Mosquitto version
+        run: sed -i 's/ARG MOSQUITTO_VERSION=${{ env.DOCKERFILE_MOSQUITTO_VERSION }}/ARG MOSQUITTO_VERSION=${{ env.MOSQUITTO_VERSION_1 }}/' Dockerfile
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push on release
+        if: github.event_name == 'release' && github.event.action == 'published'
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/${{ env.DOCKERHUB_REPO }}:${{ github.event.release.tag_name }}${{ format('{0}{1}', env.MOSQUITTO_VERSION_SUFFIX, env.MOSQUITTO_VERSION_1) }}
+      -
+        name: Build and push on push
+        if: github.event_name == 'push'
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/${{ env.DOCKERHUB_REPO }}:latest${{ format('{0}{1}', env.MOSQUITTO_VERSION_SUFFIX, env.MOSQUITTO_VERSION_1) }}
+  mosq_2:
+    name: Build and publish with Mosquitto version 2.x
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      - 
+        name: Set Mosquitto version
+        run: sed -i 's/ARG MOSQUITTO_VERSION=${{ env.DOCKERFILE_MOSQUITTO_VERSION }}/ARG MOSQUITTO_VERSION=${{ env.MOSQUITTO_VERSION_2 }}/' Dockerfile
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push on release
+        if: github.event_name == 'release' && github.event.action == 'published'
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/${{ env.DOCKERHUB_REPO }}:${{ github.event.release.tag_name }}${{ format('{0}{1}', env.MOSQUITTO_VERSION_SUFFIX, env.MOSQUITTO_VERSION_2) }}
+      -
+        name: Build and push on push
+        if: github.event_name == 'push'
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6
+          push: true
+          tags: |
+            ${{ secrets.DOCKERHUB_USERNAME }}/${{ env.DOCKERHUB_REPO }}:latest${{ format('{0}{1}', env.MOSQUITTO_VERSION_SUFFIX, env.MOSQUITTO_VERSION_2) }}
+            ${{ secrets.DOCKERHUB_USERNAME }}/${{ env.DOCKERHUB_REPO }}:latest
+
+
+