Workflow to create docker image for duck.

.github/workflows/duck.yml

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+name: Create duck image
+on:
+  push:
+    tags: ['*']
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    name: build
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Sanitize Version
+        run: |
+          export VERSION=${GITHUB_REF#refs/tags/release-}
+          export VERSION=${VERSION//-/.}
+          echo "VERSION=$VERSION" >> $GITHUB_ENV
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{major}}.{{minor}}.{{patch}},value=${{env.VERSION}}
+            type=semver,pattern={{major}}.{{minor}},value=${{env.VERSION}}
+            type=semver,pattern={{major}},value=${{env.VERSION}}
+      - name: Set up JDK 15
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: 15
+      - name: checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - run: |
+          export COUNT=$(git rev-list --count $GITHUB_SHA)
+          mvn -B verify --projects cli/linux --also-make -DskipTests
+          dpkg-deb -R cli/linux/target/release/duck_${{env.VERSION}}.$COUNT-1_amd64.deb .
+      - name: Log in to the Container registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        env:
+          DOCKER_BUILDKIT: 1
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM ubuntu:focal
+ENTRYPOINT ["/usr/bin/duck"]
+CMD ["--version"]
+
+COPY opt/duck /opt/duck
+RUN ln -s /opt/duck/bin/duck /usr/bin/duck