title: Encoding Problems when running an app in docker (Python, Java, Ruby, ...) with Ubuntu Containers (ascii, utf-8)
body: <p>On my own PC the application runs nice, but when it gets deployed into docker, it fails because of invalid characters.</p>
  <p>I am using the <code>ubuntu:latest</code> container and <code>python3</code>, <code>java</code> and <code>ruby</code>.</p>