feat: add grub

modules/system/default.nix

@@ -7,6 +7,7 @@ _: {
     ./auto-upgrade.nix
     ./backup.nix
     ./disks.nix
+    ./grub.nix
     ./healthcheck.nix
     ./home-manager.nix
     ./impermanence.nix

modules/system/grub.nix

@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.mySystem.grub;
+  grubTheme = pkgs.fetchFromGitHub {
+    owner = "catppuccin";
+    repo = "grub";
+    rev = "v1.0.0";
+    sha256 = "sha256-/bSolCta8GCZ4lP0u5NVqYQ9Y3ZooYCNdTwORNvR7M0=";
+  };
+in
+{
+  options.mySystem.grub = {
+    enable = lib.mkEnableOption "grub bootloader";
+  };
+
+  config = lib.mkIf cfg.enable {
+    boot.loader = {
+      systemd-boot.enable = false;
+      grub = {
+        enable = true;
+        efiSupport = true;
+        device = "nodev";
+        useOSProber = true;
+        theme = "${grubTheme}/src/catppuccin-mocha-grub-theme";
+      };
+    };
+  };
+}