fix: switch Price Scraper workflow from npm to pnpm to match project setup

- Add pnpm/action-setup@v6 step to install pnpm
- Switch cache from 'npm' to 'pnpm' for correct lockfile detection
- Replace npm ci with pnpm install --frozen-lockfile
- Replace npx tsx with pnpm scrape (reuses existing package.json script)

Fixes the 'Dependencies lock file is not found' error since
package-lock.json is gitignored and pnpm-lock.yaml is the
actual lockfile used by this project.

Author: Varun79-python

.github/workflows/price-scraper.yml

@@ -16,17 +16,22 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Install pnpm
+        uses: pnpm/action-setup@v6
+        with:
+          version: latest
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
           node-version: 22
-          cache: 'npm'
+          cache: 'pnpm'
 
       - name: Install dependencies
-        run: npm ci
+        run: pnpm install --frozen-lockfile
 
       - name: Run price scraper
-        run: npx tsx scripts/price-scraper/index.ts
+        run: pnpm scrape
         env:
           NEXT_PUBLIC_SUPABASE_URL: ${{ secrets.NEXT_PUBLIC_SUPABASE_URL }}
           SUPABASE_SERVICE_ROLE_KEY: ${{ secrets.SUPABASE_SERVICE_ROLE_KEY }}