ci: Add GitHub Actions workflow for deployment to GitHub Pages

Author: Aya-X

.github/workflows/deploy.yml

@@ -0,0 +1,41 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+          run_install: false
+
+      - name: Install dependencies
+        run: pnpm install --no-frozen-lockfile
+
+      - name: Build website
+        run: pnpm run build
+        env:
+          NODE_ENV: production
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./build/client