[docker/podman] Switch to Ubuntu 20.04 #329

	# This is a basic workflow to run lintpy.py

	name: lintpy

	# Controls when the workflow will run
	on:
	# Triggers the workflow on pushes to master and on pull requests (to any branch)
	push:
	branches:
	- master
	pull_request:

	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "lint"
	lint:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v3

	- name: Set up virtual Python environment
	run: python3 -m venv .venv; source .venv/bin/activate

	- name: Install Python dependencies
	run: python3 -m pip install -U pip "setuptools<66.0.0"; pip install -r python-requirements-lint.txt

	- name: Run lintpy.py
	run: ./util/lintpy.sh

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