Added Docker workflow

attribution to hartator (see commit fb69b47550cf74703b0e5b067e8fa2aa16bbd9c6)

.github/workflows/docker.yml

@@ -0,0 +1,46 @@
+name: Create and publish a Docker image
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - '*'
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@main
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@master
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@master
+      - name: Log in to the Container registry
+        uses: docker/login-action@master
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@master
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@master
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64/v8
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}