ci: add GitHub Actions pipeline for test, format, build and PyPI publish #1

	name: Formatter

	on:
	pull_request:
	push:
	branches: [main]
	tags: ["v*"]

	permissions:
	contents: read

	jobs:
	format:
	name: Formatter check (black)
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.12"
	cache: pip

	- name: Install black
	run: \|
	python -m pip install --upgrade pip
	python -m pip install black

	- name: Check formatting
	run: black --check .

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