Introduces documentation into the project #3

	name: Build Documentation

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2

	- name: Set up Python 3.11
	uses: actions/setup-python@v2
	with:
	python-version: '3.11'

	- name: Upgrade pip, install package, install requirements, build docs
	run: \|
	pip install --upgrade pip
	pip install .
	if [ -f ./docs/requirements.txt ]; then pip install -r ./docs/requirements.txt; fi
	pip install sphinx
	sphinx-build docs ./docs/_build/html/
	# Create an artifact of the html output.
	- uses: actions/upload-artifact@v1
	with:
	name: DocumentationHTML
	path: docs/_build/html/
	# Publish built docs to gh-pages branch.
	# ===============================
	- name: Commit documentation changes
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	git config --global user.name "${GITHUB_ACTOR}"
	git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
	git clone "https://token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git" --branch gh-pages --single-branch gh-pages

	cp -r docs/_build/html/* gh-pages/
	cd gh-pages
	touch .nojekyll

	git add .
	git commit -m "Update documentation." -a \|\| true
	# The above command will fail if no changes were present, so we ignore
	# that.
	- name: Push changes
	uses: ad-m/github-push-action@master
	with:
	branch: gh-pages
	directory: gh-pages
	github_token: ${{ secrets.GITHUB_TOKEN }}
	# ===============================

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