Use Gradle configuration cache in GitHub workflows

.github/workflows/gradle.yml

@@ -32,6 +32,8 @@ jobs:
     # See: https://github.com/gradle/actions/blob/main/setup-gradle/README.md
     - name: Setup Gradle
       uses: gradle/actions/setup-gradle@v4
+      with:
+        cache-encryption-key: ${{ secrets.GRADLE_ENCRYPTION_KEY }}
 
     - name: Build with Gradle Wrapper
       run: ./gradlew build