At present, docker configuration is extremely limited, with only really the ability to change WebAPI URL. This means that if docker users want to amend any of the configurations, they are forced to override the current settings by creating their own images, or dynamically injecting the config file (which could introduce security concerns) rather than being able to use the default image and config file and override based on the environmental variables.

The same environmental variable substitution that is used for WEBAPI_URL can also provide for many other customisations, making the solution much more customisable for docker users.