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nixos/minecraft-server: optimize world generation inside test

Due to how complex minecraft world generation has gotten in recent
years, it now can take several minutes to complete the first generation
of a world seed, even on relatively new and powerful hardware.

We are testing if a minecraft server can run inside of a nix enviroment,
and not so much about stress testing the CI.

Test running before this change:

> (finished: waiting for TCP port 43000, in 118.49 seconds)

Test running with this change:

> (finished: waiting for TCP port 43000, in 27.88 seconds)

Choice of using `level-type` and `generate-structures` was made as they
support almost every version of minecraft. These two also make it
extremely clear what it does, compared to the more complex
`generator-settings` and all its toggles.

Sofi 07c76c98 d7cef0d4

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unified split
Changed files
+2
nixos
tests
minecraft-server.nix
+2
nixos/tests/minecraft-server.nix 
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      serverProperties = {


     

       
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        enable-rcon = true;


     

       
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        level-seed = seed;


     

       

       
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+

       
        level-type = "flat";


     

       

       
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        generate-structures = false;


     

       
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        online-mode = false;


     

       
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        "rcon.password" = rcon-pass;


     

       
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        "rcon.port" = rcon-port;