Add CI workflow for merge to main

Author: codesungrape

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: Build & Quality Checks
+
+on:
+  pull_request:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+
+      - name: Make gradlew executable
+        run: chmod +x ./gradlew
+
+      - name: Run Gradle checks
+        run: ./gradlew clean check