build.yml

name: Build & Deploy

on:
  push:
    branches: ["gh_pages"]
  pull_request:
    branches: ["gh_pages"]
  workflow_dispatch:

# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
permissions:
  contents: read
  pages: write
  id-token: write

concurrency:
  group: "pages-${{ github.ref }}"
  cancel-in-progress: true

jobs:
  # Build job
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 20 #fetch the last 20 commits to get mtimes from
          lfs: true
      - name: Setup Ruby
        uses: ruby/setup-ruby@v1
        with:
          bundler-cache: true
          cache-version: 0 # Increment this number if you need to re-download cached gems
      - name: Setup Pages
        id: pages
        uses: actions/configure-pages@v3
      - name: restore files mtime
        run: |
          sudo apt -qqy update
          sudo apt -qqy install git-restore-mtime
          git restore-mtime
      - name: Build with Jekyll
        run: bundle exec jekyll build
        env:
          JEKYLL_ENV: production
      - name: test HTML validity
        run: >
          bundle exec htmlproofer _site/ 
          --disable-external true 
          --enforce-https false
          --allow-missing-href=true
          --log-level :debug
      - name: Upload artifact
        if: ${{ github.ref == 'refs/heads/gh_pages' }}
        uses: actions/upload-pages-artifact@v1

  # Deployment job
  deploy:
    if: ${{ github.ref == 'refs/heads/gh_pages' }}
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    runs-on: ubuntu-latest
    needs: build
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v1