title: How to install a python library to a pulled docker image?
body: <p>I have pulled a docker image to run airflow (pucker/airflow) and it is running well. However, I can't manage to install a new python library on this image. I have read that you have to add the package in the docker file. However, I don't know where it is stored. I work on MacOSX.</p>
  
  <p>Thanks for your help</p>