site/.github/workflows/main.yml

name: deploy
on: 
  push:
    branches:
      - master

jobs:
  build:
    name: build and deploy
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@2.3.1
    
    - name: Build Gatsby Site
      uses: jzweifel/gatsby-cli-github-action@1.0.0
      with:
        gatsby-arg: build

    - name: Deply via ssh
      uses: appleboy/scp-action@0.0.1
      with:
        host: ${{ secrets.HOST }}
        username: ${{ secrets.WEBMASTER_USERNAME }}
        password: ${{ secrets.WEBMASTER_PASSWORD }}
        source: "public/*"
        target: "html/"