Modernize packaging and CI (pyproject.toml, Tox, GHA) #6

	name: Pipeline
	on:
	pull_request:
	branches:
	- main
	push:
	branches:
	- main
	tags:
	- '[0-9]+.[0-9]+.[0-9]+'

	jobs:
	check:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	env:
	- lint
	- format
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: '3.12'
	- run: pip install tox
	- run: tox run -e ${{ matrix.env }}

	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version:
	- '3.10'
	- '3.11'
	- '3.12'
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- run: pip install tox
	- run: tox run -e py

	publish:
	if: startsWith(github.ref, 'refs/tags/')
	needs:
	- check
	- test
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: '3.12'
	- name: Install build tools
	run: pip install tox
	- name: Verify package version is same as Git tag
	run: tox run -qe ensure_version_matches -- $GIT_TAG
	env:
	GIT_TAG: ${{ github.ref_name }}
	- name: Build package and upload to PyPI
	run: tox run -e package -- upload
	env:
	TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
	TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}

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