Start using github actions matrix to run tests instead of tox and add running mypy #78

	# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
	# From https://github.com/actions/starter-workflows/blob/dacfd0a22a5a696b74a41f0b49c98ff41ef88427/ci/python-package.yml

	name: Tests
	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13.0-rc.1"]
	django-version: ["django==4.2.", "django==5.0.", "django==5.1.", "django==5.2."]
	exclude:
	- python-version: "3.12"
	django-version: "django<4.2.8"
	- python-version: "3.13.0-rc.1"
	django-version: "django<5.2"
	- python-version: "3.8"
	django-version: "django>=5.0"
	- python-version: "3.9"
	django-version: "django>=5.0"
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements_test.txt
	pip install -c requirements_test.txt ${{ matrix.django-version }}
	- name: Lint with ruff
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	make ruff-check
	- name: MyPy
	run: cd django_mail_viewer && mypy .
	- name: Run Tests
	run: \|
	coverage run --source django_mail_viewer runtests.py
	coverage report

Provide feedback