feat: update lint workflow to use pnpm for dependency management and caching

.github/workflows/lint.yml

@@ -20,13 +20,28 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '22'
-          cache: 'npm'
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: latest
+
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path)" >> $GITHUB_OUTPUT
+
+      - name: Setup pnpm cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
 
       - name: Install dependencies
-        run: npm ci
+        run: pnpm install
 
       - name: Run Next.js lint
-        run: npm run lint
-
-      - name: Build application
-        run: npm run build
+        run: pnpm lint