added ssh

modules/system/services/ssh.nix

@@ -0,0 +1,26 @@
+{ pkgs, config, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.settings.services.ssh;
+in {
+  options = {
+    settings.services.ssh.enable = lib.mkOption {
+      type = lib.types.bool;
+      description = ''
+        Enable ssh service
+      '';
+      default = false;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.openssh = {
+      enable = true;
+      ports = [ 22 ];
+    };
+
+    networking.firewall.allowedTCPPorts = [ 22 ];
+  };
+}