[general] Enable cache for CI task

.gitlab-ci.yml

@@ -6,8 +6,20 @@ before_script:
 
 build:
   stage: build
-  script: gradle assemble
+  script: gradle --build-cache assemble
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: push
+    paths:
+      - build
+      - .gradle
 
 test:
   stage: test
   script: gradle check
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: pull
+    paths:
+      - build
+      - .gradle