manatee: Enable smartd for harddrives

hosts/manatee/disk-config.nix

@@ -1,4 +1,9 @@
-{ inputs, ... }:
+{
+  inputs,
+  pkgs,
+  config,
+  ...
+}:
 {
   imports = [ inputs.disko.nixosModules.disko ];
 
@@ -47,6 +52,19 @@
       };
     };
 
+    environment.systemPackages = [
+      pkgs.smartmontools
+    ];
+
+    services.smartd = {
+      enable = true;
+      devices = [
+        { device = config.disko.devices.disk.root.device; }
+        { device = config.disko.devices.disk.disk1.device; }
+        { device = config.disko.devices.disk.disk2.device; }
+      ];
+    };
+
     networking.hostId = "0a9474e7"; # Required by ZFS
     disko.devices = {
       disk = {