Add-on module system
We want it to be easy to build applications on top of Arvados, so we should incorporate a system for add-on modules to add domain-specific UI and behavior.
- Service containers - long-lived containers that interacts with the Arvados API to provide new behavior and expose a REST API.
- Workbench 2 plug-ins - way to create add-ons for the Workbench 2 UI for domain specific views and elements.
- Managed database - sort of like the Arvados git wrapper, an API to create a new postgres databases with Arvados permissions applied.