ci: add spotless check to the verify workflow

Author: levinzonr

.github/workflows/verify.yml

@@ -16,5 +16,8 @@
           uses: actions/setup-java@v1
           with:
            java-version: 17
+        - name: Spotless check
+          run: ./gradlew spotlessCheck
+
         - name: Run Tests
           run: ./gradlew test