Port https://github.com/boostorg/outcome/pull/7 to standalone Outcome. #312

	name: Documentation

	on:
	push:
	branches:
	- develop
	- master
	pull_request:
	schedule:
	- cron: '0 0 1 * *'

	jobs:
	documentation:
	name: "Regenerate and publish Documentation"
	runs-on: ubuntu-20.04
	env:
	NAME: Documentation

	steps:
	- name: Checkout Documentation
	uses: actions/checkout@v2
	with:
	fetch-depth: 0
	submodules: recursive

	- name: Force cmake version to older than runner's
	uses: jwlawson/actions-setup-cmake@v1.12
	with:
	cmake-version: '3.22.2'

	- name: Cache Hugo
	id: cache-hugo
	uses: actions/cache@v2
	with:
	path: hugo_bin
	key: documentation-hugo_bin

	- name: Download Hugo
	if: steps.cache-hugo.outputs.cache-hit != 'true'
	shell: bash
	run: \|
	wget -O hugo.tar.gz https://github.com/gohugoio/hugo/releases/download/v0.52/hugo_0.52_Linux-64bit.tar.gz
	mkdir hugo_bin
	tar xf hugo.tar.gz -C hugo_bin

	- name: Regenerate Documentation
	shell: bash
	run: \|
	export PATH=$PATH:`pwd`/hugo_bin
	cd doc/html
	git checkout gh-pages
	cd ../..
	CXX=clang++ ctest -S .docs.cmake -V
	cd doc/html
	echo "google-site-verification: google5fc8a1f8de4b73f0.html" > google5fc8a1f8de4b73f0.html

	- name: Publish Documentation
	uses: JamesIves/github-pages-deploy-action@3.7.1
	with:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	BRANCH: gh-pages
	FOLDER: doc/html
	CLEAN: true

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