feat(pikachu): add Fabric Minecraft guest

configs/nixos/modules/services/games/minecraft.nix

@@ -0,0 +1,42 @@
+{
+  config,
+  inputs,
+  lib,
+  pkgs,
+  ...
+}:
+{
+  imports = [ inputs.nix-minecraft.nixosModules.minecraft-servers ];
+
+  options.modules.services.games.minecraft.enable = lib.mkEnableOption "Fabric Minecraft server";
+
+  config = lib.mkIf config.modules.services.games.minecraft.enable {
+    nixpkgs.overlays = [ inputs.nix-minecraft.overlays.default ];
+
+    services.minecraft-servers = {
+      enable = true;
+      eula = true;
+      openFirewall = true;
+      dataDir = "/data";
+
+      managementSystem = {
+        tmux.enable = false;
+        systemd-socket.enable = true;
+      };
+
+      servers.main = {
+        enable = true;
+        package = pkgs.fabricServers.fabric-1_21_1;
+        jvmOpts = [
+          "-Xms1G"
+          "-Xmx4G"
+        ];
+        serverProperties = {
+          "enable-rcon" = false;
+          "online-mode" = true;
+          "white-list" = false;
+        };
+      };
+    };
+  };
+}