title: Dockerfile supervisord cannot find path
body: <p>For some reason supervisord cannot start up when executing docker run... If I log out the path where the configuration is stored for supervisord I can clearly see that the file is present.</p>
  
  <p>Below is the part of my Dockerfile thats not currently commented out.</p>
  
  <pre><code>FROM ubuntu:16.04
  MAINTAINER Kevin Gilbert
  
  # Update Packages
  RUN apt-get -y update
  
  # Install basics
  RUN apt-get -y install curl wget make gcc build-essential
  
  # Setup Supervisor
  RUN apt-get -y install supervisor
  RUN mkdir -p /var/log/supervisor
  
  COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
  
  CMD ["/usr/bin/supervisord", "-c /etc/supervisor/conf.d/supervisord.conf"]
  </code></pre>
  
  <p>Here is the error I get in terminal after running.</p>
  
  <pre><code>remote-testing:analytics-portal kgilbert$ docker run kmgilbert/portal
  Error: could not find config file  /etc/supervisor/conf.d/supervisord.conf
  For help, use /usr/bin/supervisord -h
  </code></pre>