ci(workflow): add 'npm' cache for actions/setup-node in .github/workflows (#1382)

.github/workflows/generate-theme-doc.yml

@@ -14,9 +14,10 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: setup node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: "12.x"
+          cache: npm
 
       - name: npm install, generate readme
         run: |

.github/workflows/test.yml

@@ -16,20 +16,10 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: "12.x"
-
-      - name: Cache node modules
-        uses: actions/cache@v2
-        env:
-          cache-name: cache-node-modules
-        with:
-          path: ~/.npm
-          key:
-            ${{ runner.os }}-npm-cache-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-npm-cache-
+          cache: npm
 
       - name: Install & Test
         run: |