feat: add black linter. #151

	name: test on many rays

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	run-unit-tests-on-many-rays:
	strategy:
	matrix:
	os: [ubuntu-latest]
	ray_version: [2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.4.0]

	timeout-minutes: 60
	runs-on: ubuntu-latest
	container: docker.io/library/ubuntu:latest

	steps:
	- uses: actions/checkout@v2

	- name: Install basic dependencies
	run: \|
	apt-get update
	apt-get install -yq wget gcc g++ python3.9 zlib1g-dev zip libuv1.dev
	apt-get install -yq pip

	- name: Install python dependencies
	run: \|
	python3 -m pip install virtualenv
	python3 -m virtualenv -p python3 py3
	. py3/bin/activate
	which python
	pip install pytest torch cloudpickle cryptography
	# six is required in ray-2.1.0
	pip install "protobuf<4.0" six
	pip install ray==${{ matrix.ray_version }}

	- name: Build and test
	run: \|
	. py3/bin/activate
	pip install -e . -v
	sh test.sh

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