GitHub workflow - removed post-build artifact and added gradle caching

.github/workflows/gradle.yml

@@ -20,12 +20,14 @@ jobs:
       uses: actions/setup-java@v1
       with:
         java-version: 1.8
+    - name: Cache Gradle packages
+      uses: actions/cache@v1
+      with:
+        path: ~/.gradle/caches
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+        restore-keys: ${{ runner.os }}-gradle
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
     - name: Build and Run acceptance tests
       run: ./gradlew build
-    - name: Create Build Artifacts
-      uses: actions/upload-artifact@v1
-      with:
-        name: web-api-commander.jar
-        path: build/libs/
+    - name: Create Build Artifacts