fix(steps): add unit test and fix null cols for impute #349

	name: Build and Test

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]
	paths-ignore:
	- "README.md"
	release:
	types: [published]

	jobs:
	lint:
	name: Lint
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

	- name: Run pre-commit hooks
	uses: pre-commit/[email protected]

	test:
	name: Test
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

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

	- name: Install IbisML
	run: \|
	pip install '.[dev]'

	- name: Run tests and collect coverage
	run: pytest --cov .

	- name: Upload coverage reports to Codecov
	uses: codecov/codecov-action@v4
	with:
	token: ${{ secrets.CODECOV_TOKEN }}

	publish:
	needs: [lint, test]
	name: Publish Release to PyPI
	runs-on: ubuntu-latest
	if: github.event_name == 'release' && github.event.action == 'published'

	steps:
	- uses: actions/checkout@v3

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

	- name: Install build dependencies
	run: pip install build

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

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