Add documentation about setting up spack #687


	name: publish

	on:
	push:
	workflow_dispatch:
	schedule:
	# * is a special character in YAML so you have to quote this string
	- cron: '0 0 * * *' # end of every day



	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-python@v2
	with:
	python-version: 3.9
	- name: Install Requirements
	run: \|
	pip install --upgrade pip
	pip install -r requirements.txt
	- name: Fetch external sources
	run: \|
	bash .github/scripts/fetch_external_sources.sh
	- name: Sphinx build
	run: \|
	sphinx-build -M html . build
	- name: Publish gh-pages
	if: ${{ github.ref == 'refs/heads/main' }}
	run: \|
	cd build/html
	git init
	git config user.name "Key4hep bot"
	git config user.email "[email protected]"
	git remote add upstream https://vvolkl:${{ secrets.GITHUB_TOKEN }}@github.com/${GITHUB_REPOSITORY}.git

	touch .nojekyll
	git add .nojekyll
	git commit -m "Initial commit"
	git branch -m gh-pages
	touch .
	git add -A .
	git commit -m "Rebuild page at ${GITHUB_SHA}"
	git push -f upstream gh-pages:gh-pages

Provide feedback