Add build action

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+name: Java CI with Gradle
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          check-latest: true
+      - name: Build with Gradle
+        run: ./gradlew build