Add pnpm to test workflow

Author: vladshcherbin

.github/workflows/test.yml

@@ -13,10 +13,15 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10
       - name: Setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'pnpm'
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
       - name: Run tests