Move disabling wifi power saving to a host-specific file.

nix/configuration/hosts/odo/default.nix

@@ -6,6 +6,7 @@
     ./optimized_build.nix
     ./power_management.nix
     ./screen_brightness.nix
+    ./wifi.nix
   ];
 
   # Generate with `head -c4 /dev/urandom | od -A none -t x4`

nix/configuration/hosts/odo/wifi.nix

@@ -0,0 +1,16 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  config = {
+    environment.loginShellInit = lib.mkIf (!config.me.buildingIso) ''
+      doas iw dev wlan0 set power_save off
+    '';
+  };
+}