added yarn cache

.circleci/config.yml

@@ -28,6 +28,8 @@ jobs:
       - save_cache:
           name: save yarn package cache
           key: yarn-packages-v2{{ checksum "yarn.lock" }}
+          paths:
+            - ./node_modules
   unit-test:
     docker:
       - image: cimg/node:14.10.1
@@ -40,6 +42,8 @@ jobs:
       - save_cache:
           name: save yarn package cache
           key: yarn-packages-v2{{ checksum "yarn.lock" }}
+          paths:
+            - ./node_modules
 
 workflows:
   build_and_test: