title: Dots in ENV variable in dockerfile doesn't work
body: <p>When I declare ENV variable with dots in name, they does not set properly. To framework that I am dockerizing requires this variable to be set:</p>
  
  <pre><code>  framework.config.location 
  </code></pre>
  
  <p>Dockerfile</p>
  
  <pre><code>ENV JAVA_HOME=/opt/java/jre1.8 \
  framework.config.location=$HOME/framework/config 
  
  RUN echo $framework.config.location &amp;&amp; \
      cd $framework.config.location
  </code></pre>
  
  <blockquote>
    <p>.config.location</p>
    
    <p>/bin/sh: 1: cd: can't cd to .config.location</p>
  </blockquote>