MyApp.pm

package MyApp;

use Moose;
use Catalyst;

has my_special_flag => (is=>'ro', required=>1);

sub load_env {
  my ($target) = @_;
  return $ENV{"ADAMA_${target}"} || 
    die "Missing ENV var for $target";
}

__PACKAGE__->config(
  my_special_flag => load_env('my_special_flag'),
  ## and so on
);

sub example :Local Args(0) {
  my ($self, $c) = @_;
  $c->res->body("Got ENV: ${\$c->my_special_flag}");
}

__PACKAGE__->setup;

run with 'plackup -I. -MMyApp -e 'MyApp->psgi_app'