Add GitHub Actions for gh-pages

.github/workflows/deploy-gh-pages.yaml

@@ -0,0 +1,35 @@
+name: Deploy gh pages
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - uses: actions/cache@v4
+        with:
+          path: ~/.npm
+          key: node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            node-
+
+      - name: Build
+        run: |
+          npm ci
+          npm run build
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./dist