test: lets see if the firewall can be set up and nmap installed

machines/test01.nix

@@ -0,0 +1,15 @@
+{ pkgs, ... }:
+
+{
+  imports = [
+    # base settings for alls ervers
+    ./base.nix
+
+    # applications for this particular server
+    ./applications/firewall.nix
+  ];
+
+  environment.systemPackages = [
+    pkgs.nmap
+  ];
+}