title: Can I include another source in the default .env file?
body: <p>Is it possible with <code>docker-compose</code> to mimic following?</p>
  
  <p>the <code>.env</code> file:</p>
  
  <pre><code>...
  if [ -f "another.env" ]; then
    . ./another.env
  fi
  ....
  </code></pre>
  
  <p>I am getting no errors, just nothing happens.</p>