Passing Custom Env variables while launching k8 Pod

[ramandumcs]

Hi All, 
Is there a way to provide  env variables while launching K8 pod through K8 
executor.
we need to pass some env variable which are referred inside our Airflow 
Operator.
so can we provide custom env variable to docker run command while launching 
task pod.
Currently it seems that it supports predefined env variable.
worker_configuration.py
    def _get_environment(self):
        """Defines any necessary environment variables for the pod executor"""
        env = {
            'AIRFLOW__CORE__DAGS_FOLDER': '/tmp/dags',
            'AIRFLOW__CORE__EXECUTOR': 'LocalExecutor'
        }
        if self.kube_config.airflow_configmap:
            env['AIRFLOW__CORE__AIRFLOW_HOME'] = self.worker_airflow_home
        return env

Thanks,
Raman Gupta