Add graphviz to requirements-dev.txt #353

	name: Docs

	on:
	push:
	branches:
	- main

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: '3.8'
	- name: Install dependencies
	run: \|
	sudo apt update -y
	sudo apt install graphviz # Needed for documentation
	python -m pip install --upgrade pip
	pip install -r requirements.txt -r requirements-dev.txt -r requirements-doc.txt
	- name: Build Sphinx documentation
	run: \|
	cd docs
	make html SPHINXOPTS="-W --keep-going -n"
	- name: Commit documentation changes to gh-pages branch
	run: \|
	git clone https://github.com/pystatgen/sgkit.git --branch gh-pages --single-branch gh-pages
	mkdir -p gh-pages/latest
	cp -r docs/_build/html/* gh-pages/latest
	cd gh-pages
	git config --local user.email "[email protected]"
	git config --local user.name "GitHub Action"
	git add .
	git commit -m "Update latest documentation" -a \|\| true # Ignore error if no changes present
	- name: Push changes
	uses: ad-m/github-push-action@master
	with:
	branch: gh-pages
	directory: gh-pages
	force: true
	github_token: ${{ secrets.GITHUB_TOKEN }}

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