Add deploy workflow

.github/workflows/deploy.yml

@@ -0,0 +1,46 @@
+name: Deploy
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  deploy:
+    name: Deploy
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./client
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - name: Install Dependencies
+        run: npm ci
+      - name: Build
+        run: npm run build
+      - run: mkdir _site
+      - run: ./script/install.py --target _site
+      - name: Upload GitHub Pages Artifact
+        uses: actions/upload-pages-artifact@v1
+
+  deploy_pages:
+    needs: build
+    if: github.ref_name == 'main'
+
+    permissions:
+      pages: write
+      id-token: write
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    runs-on: ubuntu-latest
+    steps:
+    - name: Deploy to GitHub Pages
+      id: deployment
+      uses: actions/deploy-pages@v1