build: add spotless CI

.github/workflows/spotless.yaml

@@ -0,0 +1,27 @@
+name: Spotless Check
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  spotless:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: gradle
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x ./gradlew
+
+      - name: Run Spotless Check
+        run: ./gradlew spotlessCheck