added ollama configs

modules/nixos-modules/ollama.nix

@@ -0,0 +1,27 @@
+{
+  config,
+  lib,
+  ...
+}: {
+  config = lib.mkMerge [
+    {
+      services.ollama = {
+        group = "ollama";
+        user = "ollama";
+      };
+    }
+    (lib.mkIf config.host.impermanence.enable (lib.mkIf config.services.ollama.enable {
+      environment.persistence."/persist/system/root" = {
+        enable = true;
+        hideMounts = true;
+        directories = [
+          {
+            directory = config.services.ollama.models;
+            user = config.services.ollama.user;
+            group = config.services.ollama.group;
+          }
+        ];
+      };
+    }))
+  ];
+}