ci(workflow): add 'npm' cache for actions/setup-node in .github/workflows

.github/workflows/workflow.yml

@@ -4,10 +4,10 @@ on:
     branches:
       - main
     paths-ignore:
-      - '**.md'
+      - "**.md"
   pull_request:
     paths-ignore:
-      - '**.md'
+      - "**.md"
 jobs:
   run:
     name: Run
@@ -20,9 +20,10 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Setup node 12
-      uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: 12
+          cache: npm
 
       - name: npm install
         run: npm install