roles/minecraftserver: add role

roles/minecraftserver.nix

@@ -0,0 +1,37 @@
+# Module: roles/minecraftserver
+# Enables a Minecraft server on Docker
+### THIS IS A TEMPORARY CONFIG
+### WILL BE MIGRATED TO A FLAKE
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.minecraftserver;
+in
+{
+  options.minecraftserver = {
+    enable = mkEnableOption "Enables minecraftserver role";
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      docker
+      docker-compose
+    ];
+
+    virtualisation.docker = {
+      enable = true;
+      enableOnBoot = true;
+      storageDriver = "overlay2";
+      autoPrune.enable = true;
+    };
+
+    networking.firewall.allowedTCPPorts = [ 25565 ];
+  };
+}