feat: introduce treefmt and fmt all

nix/os/devices/srv0.home-ch.stefanjunker.de/system.nix

@@ -1,11 +1,4 @@
-{
-  pkgs,
-  lib,
-  config,
-  ...
-}: let
-  keys = import ../../../variables/keys.nix;
-in {
+_: {
   # TASK: new device
   networking.hostName = "srv0"; # Define your hostname.
   # networking.domain =  "home-ch.stefanjunker.de";
@@ -37,7 +30,7 @@ in {
 
   networking.nat = {
     enable = true;
-    internalInterfaces = ["ve-+"];
+    internalInterfaces = [ "ve-+" ];
     externalInterface = "eth0";
   };
 
@@ -45,14 +38,20 @@ in {
   # services.kubernetes.roles = ["master" "node"];
 
   # virtualization
-  virtualisation = {docker.enable = true;};
+  virtualisation = {
+    docker.enable = true;
+  };
 
-  nix.gc = {automatic = true;};
+  nix.gc = {
+    automatic = true;
+  };
 
   networking.useHostResolvConf = false;
-  services.resolved = {enable = true;};
+  services.resolved = {
+    enable = true;
+  };
 
-  containers = {};
+  containers = { };
 
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions