modules/homebrew: remove homebrew.whalebrews option

Whalebrew support was fully removed from Homebrew Bundle in
Homebrew 4.7.0 (Nov 2025). A `whalebrew` entry in a Brewfile now
raises `RuntimeError: Invalid Brewfile: undefined method 'whalebrew'`,
breaking the entire `brew bundle` invocation.

Use `mkRemovedOptionModule` so that existing configs get a clear
warning instead of an undefined-option error. Also removes the
auto-addition of `"whalebrew"` to `homebrew.brews` and the Brewfile
generation for Docker containers.

modules/homebrew.nix

@@ -557,23 +557,22 @@ in
   imports = [
     (mkRenamedOptionModule [ "homebrew" "autoUpdate" ] [ "homebrew" "onActivation" "autoUpdate" ])
     (mkRenamedOptionModule [ "homebrew" "cleanup" ] [ "homebrew" "onActivation" "cleanup" ])
+    (mkRemovedOptionModule [ "homebrew" "whalebrews" ] "Whalebrew support was removed from Homebrew Bundle in Homebrew 4.7.0 (Nov 2025). `whalebrew` entries in a Brewfile now cause `brew bundle` to fail. Please manage Whalebrew images directly using the `whalebrew` CLI.")
   ];
 
   options.homebrew = {
     enable = mkEnableOption ''
       {command}`nix-darwin` to manage installing/updating/upgrading Homebrew taps, formulae,
-      casks, Mac App Store apps, Go packages, Cargo crates, and Docker containers, using Homebrew
-      Bundle.
+      casks, Mac App Store apps, Go packages, and Cargo crates using Homebrew Bundle.
 
       Note that enabling this option does not install Homebrew, see the Homebrew
       [website](https://brew.sh) for installation instructions.
 
       Use the [](#opt-homebrew.brews), [](#opt-homebrew.casks),
       [](#opt-homebrew.masApps), [](#opt-homebrew.goPackages),
-      [](#opt-homebrew.cargoPackages), [](#opt-homebrew.whalebrews), and
-      [](#opt-homebrew.vscode) options to list the Homebrew formulae, casks, Mac App
-      Store apps, Go packages, Cargo crates, Docker containers, and Visual Studio Code
-      extensions you'd like to install. Use the
+      [](#opt-homebrew.cargoPackages), and [](#opt-homebrew.vscode) options to list the
+      Homebrew formulae, casks, Mac App Store apps, Go packages, Cargo crates, and
+      Visual Studio Code extensions you'd like to install. Use the
       [](#opt-homebrew.taps) option, to make additional formula repositories available to
       Homebrew. This module uses those options (along with the
       [](#opt-homebrew.caskArgs) options) to generate a Brewfile that
@@ -803,21 +802,6 @@ in
       '';
     };
 
-    whalebrews = mkOption {
-      type = with types; listOf str;
-      default = [ ];
-      example = [ "whalebrew/wget" ];
-      description = ''
-        List of Docker images to install using {command}`whalebrew`.
-
-        When this option is used, `"whalebrew"` is automatically added to
-        [](#opt-homebrew.brews).
-
-        For more information on {command}`whalebrew` see:
-        [github.com/whalebrew/whalebrew](https://github.com/whalebrew/whalebrew).
-      '';
-    };
-
     vscode = mkOption {
       type = with types; listOf str;
       default = [ ];
@@ -834,6 +818,7 @@ in
       '';
     };
 
+
     extraConfig = mkOption {
       type = types.lines;
       default = "";
@@ -868,9 +853,6 @@ in
       "homebrew.enable"
     ];
 
-    homebrew.brews =
-      optional (cfg.whalebrews != [ ]) "whalebrew";
-
     homebrew.brewfile =
       "# Created by `nix-darwin`'s `homebrew` module\n\n"
       + mkBrewfileSectionString "Taps" cfg.taps
@@ -882,7 +864,6 @@ in
         (mapAttrsToList (n: id: ''mas "${n}", id: ${toString id}'') cfg.masApps)
       + mkBrewfileSectionString "Go packages" (map (v: ''go "${v}"'') cfg.goPackages)
       + mkBrewfileSectionString "Cargo packages" (map (v: ''cargo "${v}"'') cfg.cargoPackages)
-      + mkBrewfileSectionString "Docker containers" (map (v: ''whalebrew "${v}"'') cfg.whalebrews)
       + mkBrewfileSectionString "Visual Studio Code extensions" (map (v: ''vscode "${v}"'') cfg.vscode)
       + optionalString (cfg.extraConfig != "") ("# Extra config\n" + cfg.extraConfig);