add ability to configure which services are started #23

	# source: https://medium.com/@vanflymen/blazing-fast-ci-with-github-actions-poetry-black-and-pytest-9e74299dd4a5
	# Thanks Daniel!
	#
	# Update: the action used above is no longer maintained. Updated from:
	# https://github.com/marketplace/actions/install-poetry-action
	name: CI

	on: [push]

	jobs:
	test:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v1
	with:
	fetch-depth: 1

	- name: Set up Python 3.9
	uses: actions/setup-python@v1
	with:
	python-version: 3.9

	- name: Install Poetry
	uses: snok/install-poetry@v1
	with:
	version: 1.3.2
	virtualenvs-create: true
	virtualenvs-in-project: true
	installer-parallel: true

	- name: Load cached venv
	id: cached-poetry-dependencies
	uses: actions/cache@v3
	with:
	path: .venv
	key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}

	- name: Install dependencies
	if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
	run: poetry install --no-interaction --no-root

	- name: Lint
	run: poetry run flake8

	- name: Format
	run: poetry run black . --check

	- name: Test
	run: poetry run pytest tests/

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