chore: use orb on ci rather than docker image (#70)

.circleci/config.yml

@@ -9,6 +9,8 @@ workflows:
             exclude:
               - node-version: '6'
                 prom-client-version: '12'
+orbs:
+  node: circleci/[email protected]
 version: 2.1
 jobs:
   test:
@@ -17,31 +19,21 @@ jobs:
         type: string
       prom-client-version:
         type: string
-    docker:
-      - image: node:<< parameters.node-version >>
+    executor: node/default
     steps:
       - checkout
-      - restore_cache:
-          keys:
-            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-yarn-lock-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}-{{ checksum "yarn.lock" }}
-            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-yarn-lock-master-{{ .Environment.CIRCLE_JOB }}-{{ checksum "yarn.lock" }}
-            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-yarn-cache-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}
-            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-yarn-cache-master-{{ .Environment.CIRCLE_JOB }}
-      - run:
-          name: Install dependencies
-          command: yarn install --ignore-engines
+      - node/install:
+          node-version: << parameters.node-version >>
+          install-npm: false
+          install-yarn: true
+      - node/install-packages:
+          pkg-manager: yarn
+          override-ci-command: yarn install --ignore-engines
+          cache-path: ~/.cache/yarn
+          include-branch-in-cache-key: false
       - run:
           name: Install prom-client@<< parameters.prom-client-version >>
           command: yarn add --dev prom-client@^<< parameters.prom-client-version >> --ignore-engines
       - run:
           name: Test prom-client@<< parameters.prom-client-version >>
           command: yarn test
-      - save_cache:
-          key: v{{ .Environment.CIRCLE_CACHE_VERSION }}-yarn-lock-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}-{{ checksum "yarn.lock" }}
-          paths:
-            - node_modules
-      - save_cache:
-          key: v{{ .Environment.CIRCLE_CACHE_VERSION }}-yarn-cache-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}-{{ checksum "yarn.lock" }}
-          paths:
-            - /usr/local/share/.cache/yarn
-            - /root/.cache/yarn