Add netbird service to busch

hosts/busch/default.nix

@@ -1,4 +1,4 @@
-{ inputs, outputs, config, lib, pkgs, ... }:
+{ inputs, outputs, config, lib, pkgs, pkgs-unstable, ... }:
 
 {
   imports =
@@ -26,6 +26,25 @@
   };
   networking.hostName = "busch"; # Define your hostname.
 
+  services.netbird = {
+    package = pkgs-unstable.netbird;
+    useRoutingFeatures = "both";
+    clients.wt0 = {
+      hardened = false;
+      login = {
+        enable = true;
+        setupKeyFile = (pkgs.writeText "setupKey" ''
+          A99F5508-D543-40B7-A31A-A8931B1AE246
+        '').outPath;
+      };
+      port = 51820;
+      environment = {
+        NB_MANAGEMENT_URL = "https://netbird.jfreudenberger.de";
+      };
+    };
+  };
+  systemd.services.${config.services.netbird.clients.wt0.service.name}.path = [ pkgs.shadow ];
+
   nix.settings = {
     substituters = [
       "https://cache.saumon.network/proxmox-nixos"