feat(tilo): add jellyfin configuration

system/services/default.nix

@@ -3,6 +3,7 @@
     ./calibre.nix
     ./endlessh.nix
     ./fwupd.nix
+    ./jellyfin.nix
     ./plex.nix
     ./printing.nix
     ./ssh.nix

system/services/jellyfin.nix

@@ -0,0 +1,28 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.system.services.jellyfin;
+in {
+  options.system.services.jellyfin = {
+    enable = mkEnableOption "Enable Jellyfin";
+    dataDir = mkOption {
+      type = types.string;
+      default = "/tank/jellyfin/data";
+      example = "/tank/jellyfin/data";
+    };
+    user = mkOption {
+      type = types.string;
+      default = "phundrak";
+    };
+    group = mkOption {
+      type = types.string;
+      default = "users";
+    };
+  };
+  config.services.jellyfin = mkIf cfg.enable {
+    inherit (cfg) enable group user dataDir;
+  };
+}