Remote deploy using nixos-rebuild rather than "nix shell"

flake.nix

@@ -32,16 +32,15 @@
               #!${pkgs.runtimeShell}
               set -ev
               nix-copy-closure --to ${target} ${self}
-              exec ssh -t ${target} \
-                nix shell \
-                  ${self}#nixosConfigurations.${name}.config.system.build.toplevel \
-                  --command switch-to-configuration $@
+              exec ssh -t ${target} nixos-rebuild --flake ${self}#${name} $@
             '';
           mkWake = name:
             pkgs.writeScriptBin "${name}-wake" ''
               #!${pkgs.runtimeShell}
               exec ${pkgs.wol}/bin/wol ${hostRegistry.hosts.${name}.ether}
             '';
+          # TODO: check if the ethernet address is reachable and if not,
+          # execute wol on a machine in HQ.
         in {
           glotzbert-nixos-rebuild = mkDeploy "glotzbert" "glotzbert.hq.c3d2.de";
           glotzbert-wake = mkWake "glotzbert";