unpin ubuntu version in pipeline #205

	name: Linting

	on: [push]

	jobs:
	linting:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout master
	uses: actions/checkout@master

	- name: Set up Python 3.8
	uses: actions/setup-python@v2
	with:
	python-version: 3.8

	- name: Setup Poetry
	run: \|
	export POETRY_HOME=/opt/poetry
	python3 -m venv $POETRY_HOME
	$POETRY_HOME/bin/pip install poetry==1.7.1
	$POETRY_HOME/bin/poetry --version

	- name: Install dev packages
	run: /opt/poetry/bin/poetry install -n -v

	- name: Lint with flakeheaven
	run: \|
	export PATH="/opt/poetry/bin:$PATH"
	poetry run pre-commit run --all-files

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