title: source in every Dockerfile RUN call
body: <p>I have a Dockerfile, where I am finding myself constantly needing to call <code>source /opt/ros/noetic/setup.bash</code>.</p>
  <p>e.g.:</p>
  <pre><code>RUN source /opt/ros/noetic/setup.bash \
      &amp;&amp; SOME_COMMAND
  
  RUN source /opt/ros/noetic/setup.bash \
      &amp;&amp; SOME_OTHER_COMMAND
  </code></pre>
  <p>Is there a method to have this initialised in every <code>RUN</code> call in a Dockerfile?</p>
  <p>Have tried adding to <code>~/.bash_profile</code> and Docker's <code>ENV</code> command with no luck.</p>