Replace CentOS 7 references with EL8 #306

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	# or more contributor license agreements. See the NOTICE file
	# distributed with this work for additional information
	# regarding copyright ownership. The ASF licenses this file
	# to you under the Apache License, Version 2.0 (the
	# "License"); you may not use this file except in compliance
	# with the License. You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
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	name: readthedocs/actions

	on:
	pull_request_target:

	permissions:
	pull-requests: write

	jobs:
	pull-request-links:
	runs-on: ubuntu-latest
	steps:
	- uses: readthedocs/actions/preview@v1
	with:
	project-slug: "cloudstack-documentation"

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