ci: configure GitHub Actions to deploy to GitHub Pages

Author: jetsung

.github/workflows/deploy.yml

@@ -0,0 +1,72 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+          
+      - name: Setup Just
+        uses: extractions/setup-just@v3
+        
+      - name: Build project
+        run: |
+          just build-new
+          
+      - name: Prepare GitHub Pages content
+        run: |
+          # Copy standalone build to pages directory
+          mkdir -p pages
+          cp -r dist/standalone/* pages/
+
+          # Ensure index.html exists
+          if [ ! -f pages/index.html ]; then
+            cp pages/standalone.html pages/index.html
+          fi
+          
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+        
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: './pages'
+
+  # Deployment job
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.ref == 'refs/heads/main'
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4