update

services/minecraft.nix

@@ -5,7 +5,7 @@
   ...
 }:
 let
-heap_size = "6144M";
+  heap_size = "6144M";
 in
 {
   nixpkgs.config.allowUnfreePredicate =
@@ -14,16 +14,22 @@ in
       "minecraft-server"
     ];
 
+  users.groups.minecraft = {};
+
   services.minecraft-servers = {
     enable = true;
     eula = true;
     dataDir = service_configs.minecraft.parent_dir;
     openFirewall = true;
+    group = "users";
+
     servers.${service_configs.minecraft.server_name} = {
       enable = true;
       package = pkgs.fabricServers.fabric-1_21_1;
+
       # Aikar's flags
       jvmOpts = "-Xmx${heap_size} -Xms${heap_size} -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+ParallelRefProcEnabled -XX:+PerfDisableSharedMem -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1HeapRegionSize=8M -XX:G1HeapWastePercent=5 -XX:G1MaxNewSizePercent=40 -XX:G1MixedGCCountTarget=4 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1NewSizePercent=30 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:G1ReservePercent=20 -XX:InitiatingHeapOccupancyPercent=15 -XX:MaxGCPauseMillis=200 -XX:MaxTenuringThreshold=1 -XX:SurvivorRatio=32";
+
       serverProperties = {
         server-port = service_configs.ports.minecraft;
         enforce-whitelist = true;