I'm working on an in-house implementation of a Google Cloud deployment for a Docksal sandbox VM instance. The sandboxes contained within can be considered ephemeral and can be rebuilt very easily. Therefore I would like to configure the VM to be preemptible rather than have it always be on.
I'm basing this deployment off of this repo https://github.com/docksal/sandbox-server/tree/develop/gcp-deployment-manager. Specifically, the contents of https://github.com/docksal/sandbox-server/blob/develop/gcp-deployment-manager/Docksal.jinja is what contains the server resource.
How can/should Docksal.jinja be modified to specify the VM should be preemptible?