Add github-actions

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/docker-image.yml

@@ -0,0 +1,42 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ master ]
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    branches: [ master ]
+    paths-ignore:
+      - '**.md'
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v1
+
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v1
+      with:
+       registry: ghcr.io
+       username: ${{ github.repository_owner }}
+       password: ${{ secrets.GHCR_TOKEN }}
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Build and push to ghcr
+      id: docker_build
+      uses: docker/build-push-action@v2
+      with:
+        platforms: linux/arm64
+        push: true
+        tags: ghcr.io/bbusse/hbase-exporter:latest
+
+    - name: Image digest
+      run: echo ${{ steps.docker_build.outputs.digest }}