title: Dockerfile to not cache specific RUN step
body: <p>I am wondering how to specify which step to not cache within the <code>Dockerfile</code>?</p>
  
  <p>In this example, I want to cache <code>npm install</code> but I do not want to cache <code>newman run</code>. Can I do this within this <code>Dockerfile</code>?</p>
  
  <pre><code>FROM postman/newman
  RUN npm install -g newman-reporter-teamcity
  COPY . /etc/newman
  
  # Do not cache
  RUN newman run collections.json -x --delay-request 10 -r teamcity
  </code></pre>