add ci, opt out of multisim #6

	name: Test BSB Arbor adapter

	on: [ push, pull_request ]

	jobs:
	build:
	if: github.event_name == 'push' \|\| github.event.pull_request.head.repo.full_name != github.repository
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [ "3.9", "3.10", "3.11" ]
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install apt dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install openmpi-bin libopenmpi-dev
	- name: Cache pip
	uses: actions/cache@v3
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
	restore-keys: \|
	${{ runner.os }}-pip-
	${{ runner.os }}-
	- name: Install dependencies & self
	run: \|
	python -m pip install --upgrade pip
	pip install -e .[test]
	- name: Run tests & coverage
	run: \|
	coverage run -p -m unittest
	mpiexec -n 2 coverage run -p -m unittest
	bash <(curl -s https://codecov.io/bash)

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