Update android_build.yml

.github/workflows/android_build.yml

@@ -21,6 +21,15 @@ jobs:
         distribution: 'adopt'
     - name: Setup Android SDK
       uses: android-actions/setup-android@v2
+    - name: Restore Cache
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.gradle/caches
+          ~/.gradle/wrapper
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*') }}
+        restore-keys: |
+          ${{ runner.os }}-gradle-
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
     - name: Build Debug with gradle