Implement support for multiple forks

[juliangiebel]

Ideally one instance of the map server could be used with multiple forks of ss14.
One way would be using a multi tenancy library to separate forks on a database level and have each fork use their own configuration and github bot. The separation then would be by url, e.g. https://mapserver.tanukij.dev/forkxy/maps....

A better way would be to do multitenancy manually so the same bot can be used. The separation would happen on a controller level.
The github controller would separate forks by repository and the api could either use a middleware that works the same as finbuckles url separation or use a parameter supplied with the request