added github-pages environemtn #19

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

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

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	ruby-version: ['2.7', '3.0', '3.1', '3.2']

	steps:
	- uses: actions/checkout@v4

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby-version }}
	bundler-cache: true

	- name: Run tests
	run: CI=1 bundle exec rspec --format progress

	docs:
	runs-on: ubuntu-latest
	needs: test
	if: github.ref == 'refs/heads/main'

	environment:
	name: github-pages
	url: ${{ steps.deployment.outputs.page_url }}

	steps:
	- uses: actions/checkout@v4

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: '3.4.2'
	bundler-cache: true

	- name: Generate documentation
	run: bundle exec rdoc -o docs/

	- name: Upload documentation
	uses: actions/upload-artifact@v4
	with:
	name: documentation
	path: ./docs/
	if-no-files-found: warn

	- name: Download documentation
	uses: actions/download-artifact@v4
	with:
	name: documentation
	path: ./docs/

	- name: Deploy
	uses: actions/deploy-pages@v4

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