Docker config changes, add nixarr host

hosts/nixarr/configuration.nix

@@ -0,0 +1,18 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+{
+  config,
+  pkgs,
+  ...
+}: {
+  imports = [
+    # Include the results of the hardware scan.
+    ./hardware-configuration.nix
+    ../../nixos/base.nix
+  ];
+
+  networking.hostName = "nixarr";
+
+  system.stateVersion = "25.05";
+}