Add GitHub Pages deployment workflow

Author: youngsm

.github/workflows/pages.yml

@@ -0,0 +1,54 @@
+name: Deploy GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: yarn
+          cache-dependency-path: sites/docs/yarn.lock
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+
+      - name: Install packages
+        run: yarn --cwd sites/docs install --frozen-lockfile
+
+      - name: Build static site
+        run: make docs
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: sites/docs/out
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4