Add workflow for docker release

.github/workflows/docker-release.yml

@@ -0,0 +1,73 @@
+name: Release to DockerHub (snapshot, stable)
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+jobs:
+  docker:
+    name: Publish images
+    runs-on: ubuntu-latest
+    steps:
+      # build the JARs
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Set up JDK 11
+        uses: actions/setup-java@v3
+        with:
+          java-version: 11
+          distribution: 'zulu'
+      - name: Cache Maven packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - name: Build
+        run: ./mvnw clean install -DskipTests=true
+
+      # docker workflow
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to DockerHub
+        uses: docker/login-action@v3 
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Setup variables
+        run: |
+          # set as GitHub ENV variables
+          echo "cli_version=$(\./mvnw -o org.apache.maven.plugins:maven-help-plugin:2.1.1:evaluate -Dexpression=project.version | grep -v '\[')" >> $GITHUB_ENV
+          echo "build_date=$(date -u +"%Y-%m-%dT%H:%M:%SZ")" >> $GITHUB_ENV
+          echo "DOCKER_GENERATOR_IMAGE_NAME=openapitools/openapi-generator-online" >> $GITHUB_ENV
+          echo "DOCKER_CODEGEN_CLI_IMAGE_NAME=openapitools/openapi-generator-cli" >> $GITHUB_ENV
+
+      # online images
+      - name: Publish openapi-generator-online snapshot version
+        if: github.ref_type != 'tag' # not tag (release)
+        run: |
+          docker buildx create --use
+          docker buildx build --push --platform linux/amd64,linux/arm64 --label=org.opencontainers.image.created=${{ env.build_date }} --label=org.opencontainers.image.title=openapi-generator-online --label=org.opencontainers.image.revision=$GITHUB_SHA --label=org.opencontainers.image.version=${{ env.cli_version }} -t ${{ env.DOCKER_GENERATOR_IMAGE_NAME }} ./modules/openapi-generator-online
+      - name: Publish openapi-generator-online stable version
+        if: github.ref_type == 'tag' # tagged (release)
+        run: |
+          docker buildx create --use
+          docker buildx build --push --platform linux/amd64,linux/arm64 --label=org.opencontainers.image.created=${{ env.build_date }} --label=org.opencontainers.image.title=openapi-generator-online --label=org.opencontainers.image.revision=$GITHUB_SHA --label=org.opencontainers.image.version=${{ env.cli_version }} -t ${{ env.DOCKER_GENERATOR_IMAGE_NAME }}:latest -t ${{ env.DOCKER_GENERATOR_IMAGE_NAME }}:${{ github.ref_name }} -t ${{ env.DOCKER_GENERATOR_IMAGE_NAME }} -t ${{ env.DOCKER_GENERATOR_IMAGE_NAME }}:latest-release ./modules/openapi-generator-online
+
+      # cli images
+      - name: Publish openapi-generator-cli snapshot version
+        if: github.ref_type != 'tag' # not tag (release)
+        run: |
+          cp docker-entrypoint.sh ./modules/openapi-generator-cli
+          docker buildx create --use
+          docker buildx build --push --platform linux/amd64,linux/arm64 --label=org.opencontainers.image.created=${{ env.build_date }} --label=org.opencontainers.image.title=openapi-generator-cli --label=org.opencontainers.image.revision=$GITHUB_SHA --label=org.opencontainers.image.version=${{ env.cli_version }} -t ${{ env.DOCKER_CODEGEN_CLI_IMAGE_NAME }} ./modules/openapi-generator-cli
+      - name: Publish openapi-generator-cli stable version
+        if: github.ref_type == 'tag' # tagged (release)
+        run: |
+          cp docker-entrypoint.sh ./modules/openapi-generator-cli
+          docker buildx create --use
+          docker buildx build --push --platform linux/amd64,linux/arm64 --label=org.opencontainers.image.created=${{ env.build_date }} --label=org.opencontainers.image.title=openapi-generator-cli --label=org.opencontainers.image.revision=$GITHUB_SHA --label=org.opencontainers.image.version=${{ env.cli_version }} -t ${{ env.DOCKER_CODEGEN_CLI_IMAGE_NAME }}:latest -t ${{ env.DOCKER_CODEGEN_CLI_IMAGE_NAME }}:${{ github.ref_name }} -t ${{ env.DOCKER_CODEGEN_CLI_IMAGE_NAME }} -t ${{ env.DOCKER_CODEGEN_CLI_IMAGE_NAME }}:latest-release ./modules/openapi-generator-cli