fix readthedocs build.os missing variable #121

	name: Doc build

	on:
	push:
	paths:
	- 'scFates/**'
	- 'docs/**'

	jobs:
	doc_build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0
	- name: Set up Python 3.7
	uses: actions/setup-python@v2
	with:
	python-version: 3.7
	- name: Prepare dependencies
	run: \|
	sudo apt update && sudo apt install -y pandoc
	pip install -r docs/requirements.txt
	pip install mock pandoc
	pip install --no-deps .
	- name: Build documentation
	run: \|
	sphinx-build docs/ docs/out/

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