Bump actions/checkout from 3 to 4 #26

	name: Building GitHub pages (CI)

	on: [pull_request]

	jobs:
	build:
	runs-on: ubuntu-latest

	env:
	COMMIT_AUTHOR: OPTIMADE
	COMMIT_AUTHOR_EMAIL: dev@optimade.org

	steps:
	- uses: actions/checkout@v4

	- name: Set up Python 3.8
	uses: actions/setup-python@v4
	with:
	python-version: 3.8

	- name: Install OPTIMADE
	run: \|
	python -m pip install --upgrade pip
	pip install -U setuptools
	pip install -r requirements.txt

	- name: Make pages
	run: ./make_pages.py

	- name: Build gh-pages branch locally
	run: ./commit.sh

Provide feedback