deploy_manual.yml

name: Manual deploy
on:
  workflow_dispatch

jobs:
  build_deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@master
      - run: npm install
      - run: npm run build
      - name: Deploy
        uses: peaceiris/actions-gh-pages@v3
        with:
          PUBLISH_DIR: _site 
          PUBLISH_BRANCH: gh-pages
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}