Lots of changes to the directories organisation, more work needed.

modules/common/web/cockpit-numbus/cockpit.nix

@@ -0,0 +1,28 @@
+{ pkgs, ... }:
+
+let
+  cockpit-numbus = pkgs.stdenv.mkDerivation {
+    name = "cockpit-numbus";
+    src = ./cockpit-numbus;
+    installPhase = ''
+      mkdir -p $out/share/cockpit/numbus
+      cp -r * $out/share/cockpit/numbus
+    '';
+  };
+in
+
+{
+  services.cockpit = {
+    enable = true;
+    port = 9090;
+    openFirewall = false;
+    settings = {
+      WebService = {
+        AllowUnencrypted = true;
+      };
+    };
+  };
+
+  # Link the extension into the system cockpit path
+  environment.systemPackages = [ cockpit-numbus ];
+}