ci: add a github workflow for gh-pages

.github/workflows/publish-gh-pages.yml

@@ -0,0 +1,32 @@
+name: Publish Github Pages
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  publish-gh-pages:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: pnpm/action-setup@v2
+        with:
+          version: latest
+
+      - uses: actions/setup-node@v3
+        with:
+          cache: pnpm
+          node-version: latest
+
+      - name: build
+        run: |
+          pnpm install
+          pnpm build
+
+      - name: Publish Github Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./dist