Add documentation for volume group snapshot #259

	name: pull

	# Controls when the workflow will run
	on:
	pull_request:
	branches: [ master ]

	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "build"
	build:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v2

	# The same command that users can use locally is used to build documentation.
	- name: Build documentation
	run: make

	# Publish generated site as artifact. Unfortunately viewing it requires
	# downloading a .zip and uncompressing that (https://github.com/actions/upload-artifact/issues/14#issuecomment-620728238)
	- uses: actions/upload-artifact@v2
	with:
	name: html-docs
	path: docs

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