Bump peaceiris/actions-gh-pages from 3.9.3 to 4.0.0 #207

	---
	name: build-book

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	# run on pushes and pull requests to main
	on:
	pull_request:
	branches:
	- main

	# This job installs dependencies, build the book, and pushes it to `gh-pages`

	jobs:
	build-book:
	if: (github.event.pull_request) && !contains(github.head_ref, 'all-contributors')
	strategy:
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	python_version: ['3.10', '3.11', '3.12']
	fail-fast: false # Don't cancel all jobs if one fails

	runs-on: ${{ matrix.os }}

	steps:
	- name: Checkout-repository
	uses: actions/checkout@v4
	with:
	submodules: recursive
	fetch-depth: 0

	- name: Setup Python ${{ matrix.python_version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python_version }}

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

	# Build the book
	- name: Build the book
	run: make book

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