Add gradle workflow

.github/workflows/gradle.yml

@@ -0,0 +1,80 @@
+# This workflow will build a Java project with Gradle, and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-gradle
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ "main", "v3-gradle" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+      name: Checkout
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: gradle
+
+    - name: Build with Gradle
+      run: gradle clean build
+
+    # Optional: Uploads the full dependency graph to GitHub to improve the quality of Dependabot alerts this repository can receive
+    - name: Update dependency graph
+      uses: mikepenz/gradle-dependency-submission@v1.0.06
+
+  container-image:
+    if: github.repository_owner == 'opentransportro' && github.event_name == 'push' && (github.ref == 'refs/heads/main')
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: 17
+          distribution: temurin
+          cache: gradle
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+      - name: Build container image with Jib, push to Dockerhub
+        env:
+          CONTAINER_REPO: docker.io/otrro/transitclock-server
+          CONTAINER_REGISTRY_USER: ${{secrets.DOCKER_USER}}
+          CONTAINER_REGISTRY_PASSWORD: ${{ secrets.DOCKER_AUTH }}
+        run: |
+          # we give the container two tags
+          #   - "latest"
+          #   - a string like "2.3_2022-12-12T21-38"
+  
+          version_with_snapshot=`gradle properties -q | awk '/^version:/ {print $2}'`
+          version=${version_with_snapshot/-SNAPSHOT/}
+
+          image_version=${version}
+
+          ## if the Gradle version contains SNAPSHOT, then add date to tag
+          if [[ $version_with_snapshot == *"SNAPSHOT"* ]]; then
+            image_date=`date +%Y-%m-%dT%H-%M`
+            image_version="${version}_${image_date}"
+            echo "Gradle version ${version_with_snapshot} contains SNAPSHOT, adding date to container image tag"
+          fi
+
+          gradle build jib:jib -Djib.to.tags=latest,$image_version