title: Docker: Using apt-key with alpine image
body: <p>I'm trying to use alpine (nodeJS) docker image, but I do get the error <code>/bin/sh: apt-key: not found</code>. What do I have to add?</p>
  
  <pre><code>FROM node:8.6-alpine
  RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 0C49F3730359A14518585931BC711F9BA15703C6
  </code></pre>