feat: add Gradle caching in CI workflows

This commit updates the CI build and release workflows to enable Gradle caching. This change adds `cache: gradle` to the Java setup action.
These changes apply to both `build.yaml` and `release.yaml` files.

.github/workflows/build.yaml

@@ -19,6 +19,7 @@ jobs:
         with:
           java-version: '17'
           distribution: 'temurin'
+          cache: gradle
 
       - name: Setup Android SDK
         uses: android-actions/setup-android@v3

.github/workflows/release.yaml

@@ -18,6 +18,7 @@ jobs:
         with:
           java-version: '17'
           distribution: 'temurin'
+          cache: gradle
 
       - name: Setup Android SDK
         uses: android-actions/setup-android@v3