use python3 module syntax to be more portable #123

	name: CI

	on:
	push:
	pull_request:
	branches:
	- main

	jobs:
	unit_tests:
	name: Unit Tests
	runs-on: ubuntu-latest
	strategy:
	matrix:
	container: ['ros:iron', 'ros:rolling']
	container: ${{ matrix.container }}

	env:
	PIP_BREAK_SYSTEM_PACKAGES: 1

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Install pip
	run: apt update && apt install -y python3-pip python3-pytest

	- name: Install pip dependencies
	run: \|
	python3 -m pip install -U pycodestyle flake8 flake8-blind-except flake8-builtins flake8-class-newline flake8-comprehensions flake8-deprecated flake8-docstrings flake8-import-order flake8-quotes
	python3 -m pip install .[test]
	python3 -m pip freeze

	- name: Install apt dependencies
	run: sudo apt update && sudo apt install -y doxygen graphviz

	- name: Run tests
	run: python3 -m pytest --verbose test

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