Platform: Implement Autoscaling on Routemaster [#78547098]

TODO: describe your changes

===

Pivotal tracker story [#78547098](https://www.pivotaltracker.com/story/show/78547098) in project *Platform*:

> Using hireFire
> 
> **Test Plan**
> See the application set up and working at https://manager.hirefire.io/