title: Add file into hidden folder
body: <p>I am trying to add a file from the host machine to the container into a hidden folder but it does not seem to be working. This is my Dockerfile:</p>
  
  <pre><code>FROM frekele/gradle:2.14.1-jdk8
  
  MAINTAINER Fran Garcia &lt;myemail@email.com&gt;
  
  ADD gradle.properties /root/.gradle/gradle.properties
  
  # Run
  CMD ["ls", "/root/.gradle/gradle.properties"]
  </code></pre>
  
  <p>But the file is not added. I can add this file to any other folder but not to a hidden one. Does anybody have any idea why this happens or how to fix it?</p>