add sshd for aws generators

modules/services/sshd.nix

@@ -0,0 +1,24 @@
+{ config, pkgs, lib, ... }: {
+
+  options = {
+    publicKey = lib.mkOption {
+      type = lib.types.str;
+      description = "Public SSH key authorized for this system.";
+    };
+  };
+
+  config = {
+    services.openssh = {
+      enable = true;
+      ports = [ 22 ];
+      passwordAuthentication = false;
+      gatewayPorts = "no";
+      forwardX11 = false;
+      allowSFTP = true;
+      permitRootLogin = "no";
+    };
+
+    users.users.${config.user}.authorizedKeys.keys = [ config.publicKey ];
+  };
+
+}