[codex] add CI workflow lint and whitespace checks #22

	name: CI

	on:
	pull_request:
	push:
	branches:
	- main

	jobs:
	actionlint:
	runs-on: ubuntu-latest
	timeout-minutes: 10
	permissions:
	contents: read
	steps:
	- name: Checkout repository
	uses: actions/checkout@v6

	- name: Actionlint
	uses: docker://rhysd/actionlint:1.7.12

	test:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	steps:
	- name: Checkout repository
	uses: actions/checkout@v6
	with:
	fetch-depth: 0

	- name: Check whitespace
	run: \|
	set -euo pipefail
	if [ "${{ github.event_name }}" = "pull_request" ]; then
	git fetch --no-tags --depth=1 origin "${{ github.base_ref }}"
	git diff --check "origin/${{ github.base_ref }}...HEAD"
	else
	git diff-tree --check --no-commit-id --root -r HEAD
	fi

	- name: Set up Python
	uses: actions/setup-python@v6
	with:
	python-version: "3.11"

	- name: Install package and test dependencies
	run: \|
	set -euo pipefail
	python -m pip install --upgrade pip
	python -m pip install -e . pytest ruff build

	- name: Verify dependencies
	run: python -m pip check

	- name: Ruff
	run: ruff check .

	- name: Run tests
	run: python -m pytest tests -q

	- name: Build package
	run: python -m build

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