Fix call-tasks script #460

	name: Build

	on: [push, pull_request]

	jobs:
	build:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
	celery-version: ['5.0']
	tornado-version: ['6.0']
	exclude:
	- celery-version: '5.0'
	python-version: '3.9'

	steps:
	- uses: actions/checkout@v3

	- name: Set up python
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}

	- name: Lint with flake8
	run: \|
	pip install flake8
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=13 --max-line-length=127 --statistics

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install celery==${{ matrix.celery-version }}
	pip install tornado==${{ matrix.tornado-version }}
	pip install -r requirements/default.txt
	pip install -r requirements/test.txt

	- name: Run unit tests
	run: \|
	python -m flower --version
	python -m tests.unit.__main__

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