nixos/gitlab: Add gnutar and gzip to gitlab-sidekiq's path

Tar and gzip are needed when importing GitLab project exports.

nixos/modules/services/misc/gitlab.nix

@@ -673,6 +673,10 @@ in {
         openssh
         nodejs
         gnupg
+
+        # Needed for GitLab project imports
+        gnutar
+        gzip
       ];
       serviceConfig = {
         Type = "simple";