Use github actions cache for releases

Author: LunNova

.github/workflows/ci.yml

@@ -53,6 +53,13 @@ jobs:
               with:
                   fetch-depth: '0' # https://github.com/shipkit/shipkit-changelog#fetch-depth-on-ci
 
+            - uses: actions/cache@v2.1.4
+              with:
+                path: |
+                  ~/.gradle/caches
+                  ~/.gradle/wrapper
+                key: releasing-${{ runner.os }}-jdk-${{ matrix.jdk }}-gradlewrapper-${{ hashFiles('**/gradle-wrapper.properties') }}-gradlescripts-${{ hashFiles('**/*.gradle*') }}
+
             - name: Set up Java 11
               uses: actions/setup-java@v1
               with: