Add GitHub Actions workflow to publish Docker container images to Doc…

…ker Hub for "next" branch and semver tag pushes.

.github/workflows/publish-container-image.yml

@@ -0,0 +1,52 @@
+name: Publish Docker container image to Docker Hub
+
+on:
+  push:
+    branches:
+      - next
+    tags:
+      - v*
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to registry
+        uses: docker/login-action@v2.0.0
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Extract tags and labels
+        id: meta
+        uses: docker/metadata-action@v4.0.1
+        with:
+          images: ${{ github.repository }}
+
+      - name: Build container image
+        uses: docker/build-push-action@v3.0.0
+        with:
+          context: .
+          file: docker/Dockerfile
+          tags: local:test
+          labels: ${{ steps.meta.outputs.labels }}
+          load: true
+
+      - name: Test container image
+        run: docker run --rm -v $PWD:/workdir local:test "*.md"
+
+      - name: Push container image
+        uses: docker/build-push-action@v3.0.0
+        with:
+          context: .
+          file: docker/Dockerfile
+          platforms: linux/arm64,linux/amd64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          push: true

docker/Dockerfile

@@ -4,7 +4,6 @@ COPY . .
 RUN npm pack
 
 FROM node:lts-alpine
-# hadolint ignore=DL3010
 COPY --from=build /pack/markdownlint-cli2-*.tgz /
 RUN npm install --global --no-package-lock --production markdownlint-cli2-*.tgz && \
     rm /markdownlint-cli2-*.tgz
@@ -15,8 +14,8 @@ WORKDIR /workdir
 
 ENTRYPOINT ["/usr/local/bin/markdownlint-cli2"]
 
-LABEL org.opencontainers.image.description="A fast, flexible, configuration-based command-line interface for linting Markdown/CommonMark files with the `markdownlint` library"
-LABEL org.opencontainers.image.licenses="MIT"
-LABEL org.opencontainers.image.source="https://github.com/DavidAnson/markdownlint-cli2"
-LABEL org.opencontainers.image.title="markdownlint-cli2"
-LABEL org.opencontainers.image.url="https://github.com/DavidAnson/markdownlint-cli2"
+# LABEL org.opencontainers.image.description="A fast, flexible, configuration-based command-line interface for linting Markdown/CommonMark files with the markdownlint library"
+# LABEL org.opencontainers.image.licenses="MIT"
+# LABEL org.opencontainers.image.source="https://github.com/DavidAnson/markdownlint-cli2"
+# LABEL org.opencontainers.image.title="markdownlint-cli2"
+# LABEL org.opencontainers.image.url="https://github.com/DavidAnson/markdownlint-cli2"