refactor: Make target spec a discriminated union #171

	name: Run Lint and Packaging Checks

	on:
	pull_request:
	branches: [ main, master ]
	paths:
	- '**.py'
	- 'pyproject.toml'
	- 'setup.py'
	- 'setup.cfg'
	- 'requirements*.txt'
	- '.github/workflows/lint.yml'
	push:
	branches: [ main ]
	paths:
	- '**.py'
	- 'pyproject.toml'
	- 'setup.py'
	- 'setup.cfg'
	- 'requirements*.txt'
	- '.github/workflows/lint.yml'

	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.11'
	cache: 'pip'

	- name: Install dependencies
	run: \|
	python3 -m pip install --upgrade pip
	pip install .[dev]
	pip install build twine

	- name: Ruff lint
	run: ruff check .

	- name: Ruff format
	run: ruff format --check .

	- name: Build sdist and wheel
	run: python3 -m build

	- name: Check distribution metadata
	run: twine check dist/*

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