build.yml

name: Build

on:
  push:
    branches:
    - main

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
      uses: actions/checkout@v3
      with:
        ref: main

    - uses: ruby/setup-ruby@v1
      with:
        ruby-version: 2.7 # Not needed with a .ruby-version file

    - name: Build site  
      run: |
        bundle install
        bundle exec jekyll build
        
    - name: Deploy
      if: github.ref == 'refs/heads/main'
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        BRANCH: gh-pages
      run: |
        set -xo pipefail
        git remote set-url origin "https://x-access-token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"
        git checkout -b gh-pages || git checkout "${BRANCH}"
        git branch
        git config --global user.name "github-actions"
        git config --global user.email "github-actions@users.noreply.github.com"
        git status

        ls -Q | grep -v _site | xargs rm -rf        
        mv _site/* .
        rm -rf _site
        rm -rf .jekyll-cache
        [[ -n "$(git status --porcelain)" ]] || exit 0
        git add .
        git commit -m "Build $(git rev-parse source | grep -o '^.\{10\}')"
        git push origin "${BRANCH}" --force