Put this file in .github/workflows/publish-gh-page.yml

publish-gh-page.yml

name: Publish to GitHub Page

on:
  push:
    branches: [main]

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: Use Node.js 14.x
        uses: actions/setup-node@v1
        with:
          node-version: 14.x

      - name: Install dependencies
        run: npm ci

      - name: Build
        run: npm run build -- --prefix-paths
#        env:
#          GOOGLE_ANALYTICS_ID: ${{ secrets.GOOGLE_ANALYTICS_ID }}

      - name: Push built files
        run: |
          git config user.email "EMAIL"
          git config user.name "NAME"
          cp -r public/ /tmp/gh-page-public
          git fetch origin gh-pages && git checkout gh-pages
          rm -rf ./*
          cp -r /tmp/gh-page-public/* ./
          git add -A
          git commit -m "Updates"
          git push