title: Merge global and environment variables
body: <p>I need to link specific file in production environment in addition to global linked_files:</p>
  
  <p>My current configs:</p>
  
  <p>deploy.rb</p>
  
  <blockquote>
    <p>set :linked_files, ['config/database.yml']</p>
  </blockquote>
  
  <p>production.rb</p>
  
  <blockquote>
    <p>set :linked_files, ['config/database.yml', 'config/email.yml']</p>
  </blockquote>
  
  <p>Is it possible to add some files in <code>production.rb</code> to <code>linked_files</code> from <code>deploy.rb</code>?</p>
  
  <p>Like this:</p>
  
  <p>production.rb</p>
  
  <blockquote>
    <p>set :linked_files, merge('config/email.yml')</p>
  </blockquote>