Add Zsh shell to Darwin services and setup Harald's dev environment

Add Zsh to the list of available shells in the Darwin services module.
Introduce new Nix configurations for aarch64-darwin, including system packages and font settings.
Set up user-specific environment for Harald on aarch64-darwin system.

homes/aarch64-darwin/harald@m4/default.nix

@@ -0,0 +1,32 @@
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
+{
+  home = {
+    username = "harald";
+    homeDirectory = "/Users/${config.home.username}";
+    stateVersion = "23.11"; # Please read the comment before changing.
+    # sessionPath = [ "$HOME/bin" ];
+  };
+
+  metacfg = {
+
+    cli-apps = {
+      bash.enable = true;
+      fish.enable = true;
+      #neovim.enable = true;
+      bat.enable = true;
+      starship.enable = true;
+      #home-manager.enable = true;
+    };
+
+    tools = {
+      direnv.enable = true;
+      ssh.enable = true;
+      git.enable = true;
+    };
+  };
+}

modules/darwin/services/base/default.nix

@@ -41,6 +41,7 @@ in
       shells = [
         pkgs.fish
         pkgs.bash
+        pkgs.zsh
       ];
     };
 

modules/darwin/system/fonts/default.nix

@@ -27,11 +27,14 @@ in
       packages =
         with pkgs;
         [
-          noto-fonts
-          noto-fonts-cjk-sans
-          noto-fonts-cjk-serif
-          noto-fonts-emoji
-          (nerdfonts.override { fonts = [ "Hack" ]; })
+          (nerdfonts.override {
+            fonts = [
+              "Hack"
+              "FiraCode"
+              "DroidSansMono"
+              "JetBrainsMono"
+            ];
+          })
         ]
         ++ cfg.fonts;
     };

systems/aarch64-darwin/m4/default.nix

@@ -0,0 +1,23 @@
+{ lib, pkgs, ... }:
+
+with lib.metacfg;
+{
+  metacfg = {
+    suites = {
+      common = enabled;
+    };
+  };
+
+  environment.systemPackages = with pkgs; [
+    # azure-cli
+    kubectl
+    kubectx
+    k9s
+    attic-client
+    ollama
+  ];
+
+  users.users.harald.shell = pkgs.fish;
+
+  system.stateVersion = 4;
+}