System/Servenix: Add initial servenix system configuration

system/services/whats-up-docker.nix

@@ -0,0 +1,29 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  virtualisation.oci-containers.containers.whats-up-docker = {
+    image = "getwud/wud:latest";
+    autoStart = true;
+
+    dependsOn = [
+      # "pihole"
+    ];
+
+    ports = [
+      # "3001:3000"
+    ];
+
+    volumes = [
+      "/var/run/docker.sock:/var/run/docker.sock"
+    ];
+
+    environment = {};
+
+    extraOptions = [
+      "--net=behind-nginx"
+    ];
+  };
+}