ci: add automatic gh pages release

.github/workflows/gh-pages.yml

@@ -0,0 +1,31 @@
+name: GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-20.04
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Node
+        uses: actions/setup-node@v2
+        with:
+          node-version: "14"
+
+      - run: yarn install --frozen-lockfile
+      - run: yarn build
+      - run: yarn --cwd packages/playground export
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        if: ${{ github.ref == 'refs/heads/main' }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./packages/playground/out

packages/playground/package.json

@@ -6,6 +6,7 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
+    "export": "next export",
     "lint": "next lint"
   },
   "dependencies": {