Added Python 3.12 to main.yml. #456

	name: abjad

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.10", "3.11", "3.12"]

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Log environment variable(s)
	run: \|
	python --version
	python -m pip install --upgrade pip coverage
	echo HOME:
	echo $HOME
	echo GITHUB_WORKSPACE:
	echo $GITHUB_WORKSPACE
	echo PATH:
	echo $PATH
	echo PYTHONPATH:
	echo $PYTHONPATH
	- name: Install LilyPond
	run: \|
	lilypond_version=2.25.3
	lilypond_archive=lilypond-${lilypond_version}-linux-x86_64.tar.gz
	lilypond_url=https://gitlab.com/lilypond/lilypond/-/releases/
	lilypond_url=${lilypond_url}/v${lilypond_version}/downloads/${lilypond_archive}
	echo ${lilypond_url}
	cd /tmp
	wget -q ${lilypond_url}
	tar -xf ${lilypond_archive}
	- name: Install Abjad
	run: \|
	export PATH=/tmp/lilypond-2.25.3/bin:/home/runner/bin:$PATH
	export PYTHONUNBUFFERED=TRUE
	pip install -e .[dev]
	# echo the configuration file path to debug read-only-filesystem handling
	python -c "import abjad; print(abjad.Configuration().configuration_file_path)"
	scr/prime-parser-tables
	black --version
	flake8 --version
	isort --version
	mypy --version
	pip --version
	pytest --version
	lilypond --version
	- name: Run checks and tests
	run: \|
	export PATH=/tmp/lilypond-2.25.3/bin:/home/runner/bin:$PATH
	export PYTHONUNBUFFERED=TRUE
	make black-check
	make flake8
	make isort-check
	make mypy
	make pytest

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