title: How to pass securely SSH Keys to Docker Build?
body: <p>I want to create a Docker image for devs that reproduces our production servers. Those servers are configured by Ansible.</p>
  
  <p>My idea is to run an <code>ansible-pull</code> to apply all the configuration inside the container. The problem is that I need the SSH key to pull the playbook, but I don't want to share the SSH key on the Docker image.</p>
  
  <p>So, there is a way to have the SSH keys on build time without having them on run time?</p>