title: Choosing releases config for umbrella project
body: <p>I have 3 umbrella projects:</p>
  
  <ul>
  <li>business logic;</li>
  <li>Rest API;</li>
  <li>Web.</li>
  </ul>
  
  <p>I have the following config in root <code>mix.exs</code>:</p>
  
  <pre><code>releases: [
          web: [
            applications: [web_project: :permanent]
          ],
          api: [
            applications: [rest_api_project: :permanent]
          ]
        ]
  </code></pre>
  
  <p>The problem is that every time I run <code>mix release release_name</code> the runtime config is loaded from the root project, not from the projects specified.</p>
  
  <p>I even tried to load other configs the following way:</p>
  
  <pre><code>for config &lt;- "../apps/*/config/releases.exs" |&gt; Path.expand(__DIR__) |&gt; Path.wildcard() do
    import_config config
  end
  </code></pre>
  
  <p>However it doesn't seem to work, it is using the compile-time config.</p>