[#52] 🐛 change command npm -> pnpm

Author: KingNono1030

.github/workflows/chromatic.yml

@@ -18,7 +18,7 @@ jobs:
         run: npm install -g pnpm
       - name: Install dependencies
         # ⚠️ See your package manager's documentation for the correct command to install dependencies in a CI environment.
-        run: npm ci
+        run: pnpm install --frozen-lockfile
       - name: Run Chromatic
         uses: chromaui/action@latest
         with: