Add Luxon, refactor date parsing/formatting #50

	name: pre-commit

	on:
	pull_request:
	branches: [master]
	push:
	branches: [master]
	workflow_dispatch:

	jobs:
	pre-commit:
	name: "pre-commit"
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Get changed files
	id: changed-files
	uses: tj-actions/[email protected]
	- name: Parse Python version from runtime.txt
	run: \|
	sed 's/[^0-9.]//g' runtime.txt \| head > .python-version
	- name: Set up Python
	uses: actions/setup-python@v4
	- name: Install Poetry
	uses: snok/install-poetry@v1
	with:
	virtualenvs-create: true
	virtualenvs-in-project: true
	installer-parallel: true
	- name: Install dependencies with Poetry
	run: \|
	poetry install --no-root --with=dev --no-interaction --no-ansi
	# add virtual environment to path for future steps
	echo $(poetry env info --path)/bin >> $GITHUB_PATH
	- name: Run pre-commit hooks
	uses: pre-commit/[email protected]
	with:
	# only check changed files
	extra_args: "--files ${{ steps.changed-files.outputs.all_changed_files }}"

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