Update release notes check action #517

	name: Release Notes Updated

	on:
	pull_request:
	types: [opened, synchronize]

	jobs:
	release_notes_updated:
	name: release notes updated
	runs-on: ubuntu-latest
	steps:
	- name: Check for development branch
	id: branch
	shell: python
	env:
	REF: ${{ github.event.pull_request.head.ref }}
	run: \|
	from re import compile
	main = '^main$'
	release = '^release_v\d+\.\d+\.\d+$'
	dep_update = '^latest-dep-update-[a-f0-9]{7}$'
	min_dep_update = '^min-dep-update-[a-f0-9]{7}$'
	regex = main, release, dep_update, min_dep_update
	patterns = list(map(compile, regex))
	ref = os.environ["REF"]
	is_dev = not any(pattern.match(ref) for pattern in patterns)
	print('::set-output name=is_dev::' + str(is_dev))
	- if: ${{ steps.branch.outputs.is_dev == 'True' }}
	name: Checkout repository
	uses: actions/checkout@v2
	with:
	ref: ${{ github.event.pull_request.head.ref }}
	repository: ${{ github.event.pull_request.head.repo.full_name }}
	- if: ${{ steps.branch.outputs.is_dev == 'True' }}
	name: Check if release notes were updated
	run: cat release_notes.rst \| grep ":pr:\`${{ github.event.number }}\`"

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