add configuration.nix with python env

configuration.nix

@@ -0,0 +1,27 @@
+{ config, modulesPath, pkgs, lib, ... }:
+{
+  imports = [ (modulesPath + "/virtualisation/proxmox-lxc.nix") ];
+  nix.settings = { sandbox = false; };
+  proxmoxLXC = {
+    manageNetwork = false;
+    privileged = true;
+  };
+  security.pam.services.sshd.allowNullPassword = true;
+  services.openssh = {
+    enable = true;
+    openFirewall = true;
+    settings = {
+        PermitRootLogin = "yes";
+        PasswordAuthentication = false;
+    };
+  };
+
+  environment.systemPackages = with pkgs; [
+    vim
+    git
+    (python3.withPackages (p: with p; [paho-mqtt mido]))
+  ];
+
+
+  system.stateVersion = "25.05";
+}