fix: customize macOS, fix alacritty

modules/darwin/core.nix

@@ -10,7 +10,8 @@
   #
   ###################################################################################
 
-  # # enable flakes globally
+
+  # enable flakes globally
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
   nix.settings.trusted-users = ["admin"];
@@ -28,6 +29,17 @@
 
   programs.nix-index.enable = true;
 
+  # boot.loader.grub.configurationLimit = 10;
+  # do garbage collection weekly to keep disk usage low
+  nix.gc = {
+    automatic = lib.mkDefault true;
+    options = lib.mkDefault "--delete-older-than 1w";
+  };
+
+  # Manual optimise storage: nix-store --optimise
+  # https://nixos.org/manual/nix/stable/command-ref/conf-file.html#conf-auto-optimise-store
+  nix.settings.auto-optimise-store = true;
+
   # Add ability to used TouchID for sudo authentication
   security.pam.enableSudoTouchIdAuth = true;