Fix CI: add npm install for examples, enable GitHub Pages in deploy

Author: chaploud

.github/workflows/deploy.yml

@@ -29,6 +29,8 @@ jobs:
       - run: npm ci && npm run build
       - run: cd showcase && npm install && npm run build
       - uses: actions/configure-pages@v4
+        with:
+          enablement: true
       - uses: actions/upload-pages-artifact@v3
         with:
           path: showcase/dist

tests/e2e-browser/playwright.config.ts

@@ -30,12 +30,12 @@ export default defineConfig({
   ],
   webServer: [
     {
-      command: 'cd ../../examples/task-manager && npm run build && npm run preview -- --port 4173',
+      command: 'cd ../../examples/task-manager && npm install && npm run build && npm run preview -- --port 4173',
       port: 4173,
       reuseExistingServer: !process.env.CI,
     },
     {
-      command: 'cd ../../examples/multi-ns-app && npm run build && npm run preview -- --port 4174',
+      command: 'cd ../../examples/multi-ns-app && npm install && npm run build && npm run preview -- --port 4174',
       port: 4174,
       reuseExistingServer: !process.env.CI,
     },