add cache to build workflow

.github/workflows/build.yml

@@ -16,6 +16,15 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+
+      - uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*') }}
+          restore-keys: ${{ runner.os }}-gradle-
+
       - name: build
         run: |
           ./gradlew build