Update build.yml

Author: crc-32

.github/workflows/build.yml

@@ -14,6 +14,7 @@ jobs:
             ~/.gradle/wrapper
             ~/.konan/cache
             ~/.konan/dependencies
+          key: build-deps-${{ hashFiles('*gradle*') }}
       - name: Checkout source
         uses: actions/checkout@v1
       - name: Build