services: add tailscale funnel

src/modules/services/tailscale.nix

@@ -0,0 +1,27 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.tailscale;
+in
+{
+  options = {
+    services.tailscale = {
+      funnel = {
+        enable = mkEnableOption "Tailscale funnel";
+
+        target = mkOption {
+          type = types.str;
+          description = "Target host or host:port for Tailscale funnel";
+        };
+      };
+    };
+  };
+
+  config.processes = lib.mkIf cfg.funnel.enable {
+    "tailscale-funnel" = {
+      exec = "${pkgs.tailscale}/bin/tailscale funnel --yes ${cfg.funnel.target}";
+    };
+  };
+}