Added the required cairo system dependency. #211

	name: Publish website

	on:
	push:
	branches:
	- source

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

	- name: Set up Python
	uses: actions/setup-python@v6
	with:
	python-version: '3.13'

	- name: Install system dependencies (cairo)
	run: \|
	sudo apt-get update
	sudo apt-get install -y \
	libcairo2-dev \
	pkg-config

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install poetry lxml ghp-import
	poetry install
	poetry run make html
	poetry run ghp-import output

	- name: Deploy
	uses: peaceiris/actions-gh-pages@v3
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: ./output
	publish_branch: master

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