C++20 compatible polyfill for `<expected>` #147

	name: licence

	on:
	push:
	branches:
	- main
	paths:
	- '.github/workflows/licence.yml'
	- 'include/**'
	- 'tests/**'
	- 'CMakeLists.txt'
	- 'cmake/**'
	- '.fossa.yml'
	- 'LICENSE.md'
	pull_request:
	branches:
	- main
	paths:
	- '.github/workflows/licence.yml'
	- 'include/**'
	- 'tests/**'
	- 'CMakeLists.txt'
	- 'cmake/**'
	- '.fossa.yml'
	- 'LICENSE.md'
	workflow_dispatch:
	inputs:
	run_licence_check:
	description: "Run FOSSA licence check"
	required: true
	default: true
	type: boolean

	jobs:
	licence-check:
	if: ${{ github.event_name == 'push' \|\| inputs.run_licence_check }}
	runs-on:
	group: runners-arm64
	steps:
	- uses: actions/checkout@v4

	- uses: fossas/fossa-action@v1
	with:
	api-key: ${{ secrets.FOSSA_API_KEY }}

	licence-unchanged:
	if: ${{ github.event_name == 'pull_request' }}
	runs-on:
	group: runners-arm64
	env:
	LICENCE_FILE: LICENSE.md
	steps:
	- uses: actions/checkout@v4
	with:
	sparse-checkout: .
	fetch-depth: 0

	- name: Compare licence file
	id: assert
	run:
	git diff --exit-code origin/${{ github.base_ref }} -- ${LICENCE_FILE}

	- name: What happened?
	if: failure() && steps.assert.outcome == 'failure'
	run:
	echo "Your pull request appear to have attempted to modify ${LICENCE_FILE}"
	echo "If you want your name added to ${LICENCE_FILE}, please ask project maintainers."
	exit 1

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