feat: add backstop js test #24

	name: Backstop test
	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	permissions:
	contents: read

	jobs:
	backstop-tests:
	name: Visual regression tests
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v3
	with:
	persist-credentials: false

	- name: Set up Node.js
	uses: actions/setup-node@v3
	with:
	node-version: '20'
	cache: 'npm'

	- name: Install dependencies
	run: npm install ci

	- name: Build documentation
	run: \|
	pip install -e .[doc]
	tox -e doc-html

	- name: Serve documentation
	run: npx http-server -u -p 8000 ./doc/_build/html &

	- name: check if server is up
	run: curl -I http://localhost:8000 \|\| true

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