ci: add github pages deploy.

.github/workflows/deploy.yaml

@@ -0,0 +1,36 @@
+name: Deploy
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: denoland/setup-deno@v2
+        with:
+          deno-version: v2.x
+      - run: deno install
+      - run: deno run build
+      - name: Upload static files as artifact
+        id: deployment
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: dist/
+
+  # Deployment job
+  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