def pytest_addoption(parser):
    parser.addoption('--manager_db_host', action='store')



def pytest_configure(config):
    os.environ["--manager_db_host"] = config.getoption('manager_db_host')

os.getenv('manager_db_host') получаем в коде

python -m pytest tests/ -m integration --manager_db_host="host" --html=report.html --self-contained-html  ввызов