build.yml

name: Build and Deploy Website
on: ["push", "pull_request"]

jobs:
  build-and-deploy:
    runs-on: ubuntu-22.04
    steps:

      - name: Checkout code
        uses: actions/checkout@v2
        with:
          persist-credentials: false

      - name: Setup Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: '2.6'

      - name: Pull cache if available
        uses: actions/cache@v2
        with:
          path: vendor/bundle
          key: bundle-use-ruby-2.6-${{ hashFiles('**/Gemfile.lock') }}
          restore-keys: |
            bundle-use-ruby-2.6-

      - name: bundle install
        run: |
          gem install bundler:2.1.4
          bundle config deployment true
          bundle config path vendor/bundle
          bundle install --jobs 4

      - name: Build the page
        run: |
          # Jekyll offers no option for non-zero exit codes on parse errors
          # So write some custom code here
          #
          # c.f. https://github.com/jekyll/jekyll/issues/5257
          [ ! $(bundle exec jekyll build | tee /dev/stderr | grep 'Error: YAML Exception') ]

      - name: Push to GH Pages
        if: github.ref == 'refs/heads/main' && github.event_name == 'push'
        uses: JamesIves/github-pages-deploy-action@3.7.1
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          BRANCH: gh-pages
          FOLDER: _site