ci: use `npm ci` to improve CI performance

.github/workflows/lint.yml

@@ -10,11 +10,21 @@ jobs:
     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
+          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

.github/workflows/test.yml

@@ -16,21 +16,35 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x]
+        node-version: [16.5.0]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+
       - name: Setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node-version }}
-    - name: Install
-      run: npm i
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: npm-${{ hashFiles('package-lock.json') }}
+          restore-keys: npm-
+
+      - name: Install dependencies
+        run: npm ci
+
       - name: Build
         run: npm run build
+
       - name: Test
-      run: npm run test
+        run: npm test
+        env:
+          CI: true
+
       - name: Upload Coverage
         uses: codecov/codecov-action@v1