Example GitHub action to place somewhere like .github/workflows/deploy.yml

deploy.yml

name: Deploy on push to master
on:
  push:
    branches:
      - master
jobs:
  deploy:
    name: deploy
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@master
      - uses: actions/setup-node@v1
      - name: Install NPM dependencies
        run: npm ci
      - name: Build application
        run: npm run build
      - name: Deploy application
        run: npm run deploy
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}