oh-my-zsh: set ZSH_CACHE_DIR

modules/programs/oh-my-zsh.nix

@@ -45,9 +45,12 @@ in
 
   config = mkIf cfg.enable {
     home.packages = [ pkgs.oh-my-zsh ];
+
     programs.zsh.initExtra = with pkgs; ''
       # oh-my-zsh configuration generated by NixOS
       export ZSH=${oh-my-zsh}/share/oh-my-zsh
+      export ZSH_CACHE_DIR=''${XDG_CACHE_HOME:-$HOME/.cache}/oh-my-zsh
+
       ${optionalString (cfg.plugins != [])
         "plugins=(${concatStringsSep " " cfg.plugins})"
       }