How to use github actions to do CI/CD

1. create a file .github/workflows/node.js.yml

name: Node.js CI

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: mskelton/setup-yarn@v1

      - name: yarn install
        run: yarn install

      - name: yarn build
        run: yarn build 

      - name: Deploy
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.TOKEN }}
          publish_dir: ./dist

2. set GitHub secrets 

https://docs.github.com/en/actions/security-guides/encrypted-secrets#creating-encrypted-secrets-for-an-organization

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