Fix too many open files error #499

	---
	name: Tests

	on: # yamllint disable-line rule:truthy
	push:
	branches: [main]
	pull_request:
	types: [opened, synchronize]
	workflow_dispatch:

	jobs:
	Tests:
	runs-on: ubuntu-latest
	strategy:
	max-parallel: 4
	matrix:
	python-version: [3.8, 3.9, '3.10', '3.11']
	steps:
	- uses: actions/checkout@v1
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v1
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install program
	run: \|
	# All these steps are required so that mypy behaves equally than the
	# local environment, once mypy supports __pypackages__ try to use the
	# github action
	pip install virtualenv pdm
	virtualenv .venv
	source .venv/bin/activate
	pdm config python.use_venv True
	make install
	- name: Test linters
	run: make lint
	- name: Test type checkers
	run: make mypy
	- name: Test security
	run: make security
	- name: Test with pytest
	run: make test
	- name: Upload Coverage
	run: \|
	pip3 install 'coveralls[toml]'
	coveralls --service=github
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	COVERALLS_FLAG_NAME: ${{ matrix.test-name }}
	COVERALLS_PARALLEL: true
	- name: Test documentation
	run: make build-docs
	- name: Build the package
	run: make build-package
	Coveralls:
	name: Finish Coveralls
	needs: Tests
	runs-on: ubuntu-latest
	container: python:3-slim
	steps:
	- name: Finished
	run: \|
	pip3 install 'coveralls[toml]'
	coveralls --service=github --finish
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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