fix: static username in home-manager-update script

home/common/pi-base.nix

@@ -6,6 +6,7 @@
   lib,
   pkgs,
   hostname ? "AZPILOGISTIK01",
+  username ? "logistik"
   ...
 }: {
   # Home Manager needs a bit of information about you and the paths it should
@@ -345,7 +346,7 @@
   # Systemd Timer für nächtliches home-manager update
   # Der hostname wird zur Build-Zeit in das Script eingebettet
   systemd.user.services.home-manager-update = let
-    flakeConfig = "logistik@${hostname}";
+    flakeConfig = "${username}@${hostname}";
     repoUrl = "git+https://git.az-gruppe.com/AZ-Intec-GmbH/AZ-NIX.git";
   in {
     Unit = {