Adding users via external database

Hi @torkel

My team has configured Grafana and a few dashboards using the new provisioners system.
We are delivering a few dashboards to an external team who will set up their own users and credentials, though since the instance is being hosted via AWS ECS, there is no guarantee that the image will not fail to instantiate and therefore all user data and credentials could be lost.

Is there a way to add users and their passwords (not just the generic admin) using an external database or API or a configuration file that the docker image could use that we could leverage to add when a new instance of Grafana is being instantiated?

Ver: Grafana v6.6.0
Stack: AWS ECS (Fargate), ALB, Docker