add ssh for hosts

flake.nix

@@ -34,6 +34,7 @@
         ./modules/system/networking
         ./modules/system/nixsettings
         ./modules/system/shell
+        ./modules/system/ssh
         ./modules/system/systemversion
         ./modules/system/upgrades
         ./modules/system/users

modules/system/ssh/default.nix

@@ -0,0 +1,4 @@
+{ ... }:
+{
+    services.openssh.enable = true;
+}