https://airflow.apache.org/docs/apache-airflow/stable/configurations-ref.html#store-dag-code

![Captura de pantalla 2021-05-26 a las 17 47 56](https://user-images.githubusercontent.com/11339132/119691160-a2049a00-be4a-11eb-8f55-0ad2c6117620.png)

The Default is True or None?
tests/core/test_configuration.py
with tempfile.NamedTemporaryFile(delete=False) as cmd_file:
            cmd_file.write(b"#!/usr/bin/env bash\n")
            cmd_file.write(b"echo -n difficult_unpredictable_cat_password\n")
            cmd_file.flush()
            os.chmod(cmd_file.name, 0o0555)
            cmd_file.close()
            with mock.patch.dict("os.environ", {"AIRFLOW__WEBSERVER__SECRET_KEY_CMD": cmd_file.name}):
                content = conf.getsection("webserver")
            os.unlink(cmd_file.name)
        assert content["secret_key"] == "difficult_unpredictable_cat_password"
    def test_kubernetes_environment_variables_section(self):