Add simple gradle build

.github/workflows/build.yml

@@ -1,27 +1,29 @@
 name: Build
 
-on:
-  push:
-    branches: [ "main" ]
-
 jobs:
-  docker-hub:
+  build:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        java-version: ["8", "11", "17", "21"]
+
     steps:
-      - id: login
-        uses: docker/login-action@v3
-        with:
-          username: linyang1218
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - id: metadata
-        uses: docker/metadata-action@v5
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Java ${{ matrix.java-version }}
+        uses: actions/setup-java@v3
         with:
-          images: linyang1218/puml
-          tags: |
-            type=sha,prefix=commit-,format=short,suffix=-{{date 'YYYYMMDD'}}
-            type=raw,value=latest,enable={{is_default_branch}}
-      - id: push
-        uses: docker/build-push-action@v5
+          distribution: 'temurin'
+          java-version: '${{ matrix.java-version }}'
+          cache: gradle
+
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
         with:
-          push: true
-          tags: ${{ steps.metadata.outputs.tags }}
+          gradle-version: wrapper
+
+      - name: Build
+        run: ./gradlew build
+

.github/workflows/docker-image.yml

@@ -0,0 +1,27 @@
+name: Docker Image
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  docker-hub:
+    runs-on: ubuntu-latest
+    steps:
+      - id: login
+        uses: docker/login-action@v3
+        with:
+          username: linyang1218
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - id: metadata
+        uses: docker/metadata-action@v5
+        with:
+          images: linyang1218/puml
+          tags: |
+            type=sha,prefix=commit-,format=short,suffix=-{{date 'YYYYMMDD'}}
+            type=raw,value=latest,enable={{is_default_branch}}
+      - id: push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: ${{ steps.metadata.outputs.tags }}