minecraft: use docker image for forge 1.19.2 server

nix-minecraft does not support forge and its hard to try and get forge
to install

flake.nix

@@ -70,7 +70,7 @@
         nix-minecraft.nixosModules.minecraft-servers
         { nixpkgs.overlays = [ inputs.nix-minecraft.overlay ]; }
         ./modules/games/server/minecraft/default.nix
-        ./modules/games/server/minecraft/forge-impure.nix
+        ./modules/games/server/minecraft/forge-1.19.2.nix
 
         ./modules/users/nico.nix
 

modules/games/server/minecraft/forge-1.19.2.nix

@@ -0,0 +1,32 @@
+{ config, pkgs, ... }:
+
+{
+  virtualisation.oci-containers.containers.forge-1-19-2 = {
+    user = "minecraft:minecraft";
+    image = "docker.io/itzg/minecraft-server";
+    volumes = [ "/var/lib/minecraft/forge-1-19-2/:/data" ];
+    ports = [ "30004:30004" ];
+    environment = {
+      TYPE = "FORGE";
+      VERSION = "1.19.2";
+      EULA = "TRUE";
+      MEMORY = "4G";
+      SERVER_PORT = "30004";
+
+
+      UID = "992";
+      GID = "991";
+    };
+  };
+
+  services.minecraft-servers.servers.velocity.symlinks."velocity.toml".value = {
+    servers = {
+      forge-1-19-2 = "127.0.0.1:30004";
+
+      # In what order we should try servers when a player logs in or is kicked from a server.
+      try = [
+          "forge-1-19-2"
+      ];
+    };
+  };
+}

modules/games/server/minecraft/forge-impure.nix

@@ -1,32 +0,0 @@
-{ config, pkgs, ... }:
-
-let
-  forge-impure = pkgs.vanillaServers.vanilla.overrideAttrs (oldAttrs: {
-    src = ./forge.jar;
-  });
-in
-{
-  services.minecraft-servers.servers.forge-impure = {
-    enable = true;
-    package = forge-impure;
-    autoStart = true;
-    jvmOpts = "-Xms4096M -Xmx4096M";
-
-    serverProperties = {
-      server-port = 30004;
-      difficulty = 3;
-      max-players = 30;
-    };
-  };
-
-  services.minecraft-servers.servers.velocity.symlinks."velocity.toml".value = {
-    servers = {
-      fabric-modless = "127.0.0.1:30004";
-
-      # In what order we should try servers when a player logs in or is kicked from a server.
-      try = [
-          "forge-impure"
-      ];
-    };
-  };
-}