Add workflow to publish to github pages

.github/workflows/publish.yml

@@ -0,0 +1,36 @@
+name: Publish
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+
+      - name: Install
+        run: npm install
+
+      - name: Build
+        continue-on-error: false
+        run: npm run-script build
+
+      - name: Publish
+        if: github.event_name == 'push'
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: build
+          publish_branch: public