add mypy checks #3

	name: mypy
	on: [pull_request]
	jobs:
	mypy:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.11.x'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install .
	- name: Check with mypy
	run: \|
	# TODO: make this work with exclusion rules from pyproject.toml
	pip freeze
	mypy . --exclude alembic/env.py --exclude src/letsrolld/db/models.py

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