Provide the ability for GameServers to set custom Kubernetes Labels and allocate towards them

[dgkanatsios]

There can be cases where users want to create a single Build but want different configuration for their GameServers. For instance, for an FPS game, we might want X number of servers of the Build to load map A, Y number of servers to load map B etc. At the same time, we would like to allocate towards servers with map A or map B etc. To achieve this we should:

• provide an extra (outside of GSDK) endpoint for users to create these custom Labels
• provide an extra (optional) argument on the allocation service API endpoint for users to allocate towards a custom Label.