add github action

.github/workflows/docker.yml

@@ -0,0 +1,51 @@
+name: Docker
+
+on:
+  release:
+    types: [published]
+  push:
+    branches:
+      - 'dev*'
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      # Get the repository's code
+      - name: Checkout
+        uses: actions/checkout@v3
+      # https://github.com/docker/setup-qemu-action
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Docker meta
+        id: meta # you'll use this in the next step
+        uses: docker/metadata-action@v4
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            asauerwein/splunk-mqtt
+          # Docker tags based on the following events/attributes
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: Dockerfile
+          platforms: linux/amd64,linux/arm/v6, linux/arm/v7, linux/arm64/v8
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          push: True