pages.yml

# Build the Jekyll site on every push and pull request; deploy to GitHub Pages
# only from main. Uses the Jekyll version pinned in the Gemfile, not GitHub
# Pages' built-in Jekyll 3.10.
#
# One-time setup: Settings → Pages → Build and deployment → Source: GitHub
# Actions. After that, every push to main builds AND deploys automatically;
# pushes to other branches and PRs build only (a green/red validation signal),
# with no deploy.

name: Build and deploy site

on:
  push:
    branches: ["**"]      # build on a push to ANY branch
  pull_request:
    branches: [main]      # build on PRs targeting main
  workflow_dispatch:      # allow manual runs from the Actions UI

permissions:
  contents: read
  pages: write
  id-token: write

# Don't cancel an in-flight deploy; queue instead.
concurrency:
  group: "pages-${{ github.ref }}"
  cancel-in-progress: false

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repo
        uses: actions/checkout@v5

      - name: Set up Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: "3.3"
          bundler-cache: true     # caches Gemfile.lock deps automatically

      - name: Configure GitHub Pages
        id: pages
        uses: actions/configure-pages@v6

      - name: Build with Jekyll
        # --baseurl renders absolute URLs under /<repo-name>/ for project Pages.
        run: |
          bundle exec jekyll build \
            --baseurl "${{ steps.pages.outputs.base_path }}"
        env:
          JEKYLL_ENV: production

      - name: Upload artifact
        uses: actions/upload-pages-artifact@v5
        # actions/configure-pages already points this at _site/.

  deploy:
    needs: build
    # Deploy ONLY when this is a push to main — never from PRs or feature
    # branches. Those still run the build job above as a validation check.
    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v5