add workflow

.github/workflows/build.yaml

@@ -0,0 +1,19 @@
+name: Build
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v2
+    - name: Execute Gradle build
+      run: ./gradlew build