Add ci cd for gradle build

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        java-version: [17]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up JDK ${{ matrix.java-version }}
+        uses: actions/setup-java@v2
+        with:
+          java-version: ${{ matrix.java-version }}
+          distribution: 'temurin'
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build with Gradle
+        run: ./gradlew clean build