Re-add caching

Author: robotgryphon

.github/workflows/ci-tests.yml

@@ -40,12 +40,14 @@ jobs:
         with:
           java-version: "8.0.282"
 
-#       - name: Cache Gradle packages
-#         uses: actions/cache@v2
-#         with:
-#           path: ~/.gradle/caches
-#           key: ${{ runner.os }}-gradle
-#           restore-keys: ${{ runner.os }}-gradle
+      - name: Cache Gradle packages
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: ${{ runner.os }}-gradle-
 
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew