ci: cache npm dependencies

Author: vs-cristian

.circleci/config.yml

@@ -10,9 +10,15 @@ jobs:
           - next
     steps:
       - checkout
+      - restore_cache:
+          key: dependency-cache-{{ checksum "package-lock.json" }}
       - run:
           name: install
-          command: npm install
+          command: npm ci
+      - save_cache:
+          key: dependency-cache-{{ checksum "package-lock.json" }}
+          paths:
+            - $HOME/.npm
       - run:
           name: test
           command: npm run test