Deploy the demo automatically for GitHub Releases

.github/workflows/pages.yml

@@ -0,0 +1,63 @@
+name: Deploy demo to GitHub Pages
+
+on:
+  release:
+    types:
+      - published
+  workflow_dispatch:
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    name: Build demo
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v7
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v7
+        with:
+          node-version: 24
+          cache: npm
+
+      - name: Verify public npm registry
+        run: |
+          test "$(npm config get registry)" = "https://registry.npmjs.org/"
+          ! grep -R "bnpm.byted.org" --include="package-lock.json" .
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Build demo
+        run: npm run doc
+
+      - name: Configure GitHub Pages
+        uses: actions/configure-pages@v6
+
+      - name: Upload GitHub Pages artifact
+        uses: actions/upload-pages-artifact@v5
+        with:
+          path: pages-build
+
+  deploy:
+    name: Deploy demo
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v5

AGENTS.md

@@ -52,6 +52,13 @@ npm --prefix ssr-test start
 
 Open `http://127.0.0.1:8005/`. Confirm that the initial HTML is server-rendered and that the viewer becomes interactive after client hydration.
 
+## Releases and GitHub Pages
+
+Publishing a GitHub Release triggers `.github/workflows/pages.yml`. The workflow
+builds the demo from the released tag and deploys `pages-build/` through GitHub
+Pages. After each release, wait for the Pages workflow and verify
+<https://infeng.github.io/react-viewer/> before considering the release complete.
+
 ## Code map
 
 - `src/Viewer.tsx`: portal/container lifecycle.