Mypy example check

mypy.yaml

name: mypy
on: [push, pull_request]
jobs:
  mypy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          python-version: '3.10' 
      - run: python3 -m pip install -U git+https://github.com/python/mypy.git
      - run: mypy .