Add docker workflow

.github/workflows/docker.yml

@@ -0,0 +1,43 @@
+name: Docker
+on:
+  push:
+  schedule:
+    - cron: "42 2 2 * *"
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  REPO_NAME: ${{ github.repository }}
+
+jobs:
+  buildDockerImage:
+    name: Build Docker image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: nschloe/action-cached-lfs-checkout@v1
+        with:
+          submodules: recursive
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Repo name
+        run: echo "IMAGE_ID=$(echo ${{ env.REGISTRY }}/${{ env.REPO_NAME }} | tr '[A-Z]' '[a-z]')" >> $GITHUB_ENV
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: "${{ env.IMAGE_ID }}"
+          tags: type=sha, prefix={{date 'YYYYMMDD'}}-
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          push: ${{ github.ref == 'refs/heads/main' }}