overlays: Implement overlays option #723

	name: Run tests

	on: [push, pull_request]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.6]

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: '3.x'

	- name: Install deps
	run: \|
	python -m pip install --upgrade pip
	pip install black
	pip install flit
	pip install tuxpkg
	pip install py
	pip install pytest==8.0.0
	pip install pytest-cov
	pip install pytest-parallel
	export FLIT_ROOT_INSTALL=1
	flit install --symlink

	- name: Linting
	run: \|
	make style

	- name: run unittest
	run: \|
	make test

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