add open-webui as ai chat ui service

nixos/configurations/Tytonidae/default.nix

@@ -35,6 +35,7 @@
         enable = true;
         unixName = "david";
       };
+      open-webui.enable = true;
     };
     gui.enabled = "cosmic";
   };

nixos/modules/default.nix

@@ -27,6 +27,7 @@
       ./tailscale.nix
       ./kanata.nix
       ./kvm.nix
+      ./open-webui.nix
     ];
 
   config = {

nixos/modules/open-webui.nix

@@ -0,0 +1,21 @@
+{ config, lib, ... }:
+let
+  cfg = config.youthlic.programs.open-webui;
+in
+{
+  options = {
+    youthlic.programs.open-webui = {
+      enable = lib.mkEnableOption "open-webui";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    services.open-webui = {
+      enable = true;
+      port = 8083;
+      environmentFile = "${config.sops.secrets."open-webui_env".path}";
+    };
+    sops.secrets."open-webui_env" = {
+      format = "yaml";
+    };
+  };
+}