replace npm by pnpm for CI

.github/workflows/deploy.yml

@@ -6,11 +6,15 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
       - uses: actions/setup-node@v4
         with:
           node-version: 20
-      - run: npm ci
-      - run: npm run build
+          cache: "pnpm"
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm build
       - run: tar -czf build.tar.gz .output
       - uses: actions/upload-artifact@v4
         with:
@@ -21,12 +25,20 @@ jobs:
     runs-on: ubuntu-22.04
     needs: build
     steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: "pnpm"
+      - run: pnpm install --frozen-lockfile --prod
       - uses: actions/download-artifact@v4
         with:
           name: nuxt-build
       - run: tar -xzf build.tar.gz
-      - run: npm ci --omit=dev
-      - run: npm run start &
+      - run: pnpm start &
       - run: npx wait-on http://localhost:3000
       - run: curl -f http://localhost:3000 || exit 1