add github workflow

.github/workflows/gh-pages.yml

@@ -0,0 +1,32 @@
+name: Github Pages
+
+on:
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - name: Install
+        run: pnpm install
+
+      - name: Build
+        run: pnpm run build
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        if: github.ref == 'refs/heads/main'
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./public