fix(remote build): actually the config needs to be systemwide

This makes some amount of sense, since it would probably be the nix
daemon that is connecting to the remote build machine.

nixos/configuration.nix

@@ -366,6 +366,14 @@ in
     dockerSocket.enable = true;
   };
 
+  # configure ssh
+  programs.ssh = {
+    enable = true;
+    # ensure remote nix build can acces nix environment
+    # https://wiki.nixos.org/wiki/Distributed_build
+    matchBlocks.void.setEnv.PATH = "/nix/var/nix/profiles/default/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
+  };
+
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
   # on your system were taken. It‘s perfectly fine and recommended to leave