hcloud: these settings apparently fixes the changing hostname issue

The hostname would change to "nixos" whenever updating the
configuration, with these settings that doesn't seem to happen. So now
each machine can use a generic profile rather than a specially named one.

Author: johnae

profiles/hardware/hcloud.nix

@@ -28,7 +28,9 @@
   services.cloud-init.enable = true;
   services.cloud-init.network.enable = true;
   networking.dhcpcd.enable = false; ## we're using cloud-init
-  networking.hostName = hostName;
+  networking.hostName = "";
+  networking.useNetworkd = true;
+  systemd.network.enable = true;
 
   nix = {
     settings.trusted-users = ["root"];