Add Pages workflow to serve app

Author: nickarora

.github/workflows/deploy-app.yml

@@ -0,0 +1,39 @@
+name: Deploy /app to GitHub Pages
+
+on:
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Configure GitHub Pages
+        uses: actions/configure-pages@v5
+
+      - name: Prepare Pages artifact
+        run: |
+          mkdir public
+          cp -R app/* public/
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: public
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4