Update actions/checkout action to v4 #138

	name: Python package

	on:
	pull_request:
	push:
	branches: [main]

	jobs:
	build:
	runs-on: ${{ matrix.os }}
	strategy:
	max-parallel: 6
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	python-version: ['3.8', '3.10']

	steps:
	- uses: actions/checkout@v4

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: 'pip'
	cache-dependency-path: \|
	pyproject.toml
	ci/requirements.txt

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade --quiet pip build flake8 pytest

	- name: Lint with flake8
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics

	- name: Install local editable
	run: \|
	pip install -e .

	- name: Test with pytest
	run: \|
	pytest --showlocals -vrsx .

	- name: Attempt to install library
	run: \|
	pip install .
	condax ensure-path

	- name: Use library to add a package
	run: \|
	condax install black

	- name: Run the installed package
	run: \|
	export PATH="$PATH:${HOME}/.local/bin"
	black --help
	if: matrix.os != 'windows-latest'

	- name: Run the installed package
	run: \|
	$env:Path = "$PATH;${HOME}/.local/bin"
	black --help
	if: matrix.os == 'windows-latest'

	- name: Remove the installed package
	run: \|
	condax remove black

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