my $target = shift;
my $password;
if ($target eq 'premiere') { 
  $password = 'change me';
  $extra_functionality = # Rendered from template call, or
                         # should do_build() handle this?
} elsif ($target eq 'dev') { 
  $password = 'dev password';
  $experimental_features = # Load from the template
} else { # default 
  $password = 'change me';
}
do_build( $password, $extra_functionality, $experimental_features );