chore: pnpm package로 변경

.github/workflows/chromatic.yml

@@ -11,8 +11,11 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Install package manager
+        run: npm i -D pnpm
+
       - name: Install dependencies
-        run: npm install
+        run: pnpm build
 
       - name: Run Chromatic
         uses: chromaui/action@latest