Hook for when server is spawned

[milandeepbassi]

Proposed change

So I was looking at the following plugin which uses the new user creation hook: https://github.com/LTluttmann/tljh-repo2user-dir

I was wondering is it possible to create a hook for when users are spawned? The intention being to Clear the users directory and fresh pull a server on spawn if this instance meets some criteria by checking a users username against an external API or DB.

Who would use this feature?

This scenario is specific to me but I feel like a hook for when the server is spawned could be beneficial for many users.

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