Manual update from ferrocene/ferrocene #175

	# SPDX-License-Identifier: MIT OR Apache-2.0
	# SPDX-FileCopyrightText: The Ferrocene Developers

	---

	name: CI
	on: [push, pull_request]

	permissions:
	contents: read

	jobs:
	lint:
	name: Lints
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v4

	# Some Ferrocene builders require the use of Python 3.9. Use that on CI
	# to make sure there are no surprises when we import into Ferrocene.
	- uses: actions/setup-python@v3
	with:
	python-version: "3.9.x"

	- name: Check that the requirements are installable
	run: python3 -m pip install -r requirements.txt

	- name: Install linting dependencies
	run: python3 -m pip install reuse black flake8

	- name: Verify licensing metadata
	run: reuse lint

	- name: Verify Python code formatting
	run: black . --check --diff --color

	- name: Lint Python code with flake8
	run: flake8 .

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