error: config contains the wrong home directory for hydra-queue-builder, aborting activation
nix-darwin does not support changing the home directory of existing users.

Please set:

    users.users.hydra-queue-builder.home = "/private/var/lib/hydra-queue-builder";

or remove it from your configuration.

users = {
  users.hydra-queue-builder = {
    uid = lib.mkDefault 535;
    gid = lib.mkDefault config.users.groups.hydra.gid;
    home = lib.mkDefault "/var/lib/hydra-queue-builder";
    shell = "/bin/bash";
    description = "hydra-queue-builder service user";
  };
  knownUsers = [ "hydra-queue-builder" ];
  groups.hydra = {
    gid = lib.mkDefault 535;
    description = "Nix group for hydra-queue-builder service";
  };
  knownGroups = [ "hydra" ];
};