make protobuf an optional requirement #151

	name: Test
	on:
	push:
	branches:
	- master
	pull_request:
	jobs:
	check:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/setup-python@v5
	with:
	python-version: '3.12'
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0
	- run: pip install riot==0.19.0
	- run: riot -v run check_fmt
	- run: riot -v run -s mypy
	- run: riot -v run -s flake8

	test:
	strategy:
	matrix:
	os: [ubuntu-latest, macos-latest]
	python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
	runs-on: ${{ matrix.os }}
	steps:
	- uses: actions/checkout@v4
	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: install riot
	# Note that pip3 has to be used since the system pip when running
	# under the 2.7 instance will be Python 2 pip.
	# (riot is not Python 2 compatible)
	run: pip3 install riot==0.19.0
	- run: \|
	riot run -p ${{ matrix.python-version}} test

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