ci: use npm ci to improve CI performance

.github/workflows/lint.yml

@@ -8,13 +8,23 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - name: Checkout
-      uses: actions/checkout@v2
-    - name: Setup Node.js
-      uses: actions/setup-node@v1
-      with:
-        node-version: 16.x
-    - name: Install
-      run: npm i
-    - name: Lint
-      run: npm run lint
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 16.5.0
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: npm-${{ hashFiles('package-lock.json') }}
+          restore-keys: npm-
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint