title: Start and stop Airflow?
body: <p>I'm testing airflow google composer but right now I don't use it all the time and it cost money to maintains the 3 VM. Is there a way to stop/start google composer/airflow ? </p>
  
  <p>Is it possible to do it programmatically ? (I want to start it every morning at 9am and stop it every night at 9pm and the week-end)</p>
  
  <p>Right now to stop most of the costs I change the number of VM in Kubernetes Engine (I switch from 3 to 0 to stop it and then to 0 to 3 to start it) but maybe there is a better way.</p>