circleci config setup npm cache

.circleci/config.yml

@@ -8,7 +8,17 @@ aliases:
           username: $DOCKERHUB_USERNAME
           password: $DOCKERHUB_PASSWORD
     working_directory: ~/repo
-
+  - &save_npm_cache
+    save_cache:
+      paths:
+        - node_modules
+      keys:
+        v1-npm-{{ checksum "package-lock.json" }}
+  - restore_npm_cache
+    restore_cache:
+      keys:
+        - v1-npm-{{ checksum "package-lock.json" }}
+        - v1-npm-
 jobs:
   setup:
     <<: *defaults