Add /home/docker/.local/bin to PATH

If ~/.local/bin is not in PATH then the following warning will be
displayed when using pip install

  The scripts f2py, f2py3 and f2py3.6 are installed in '/home/docker/.local/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.

Author: matthewfeickert

Dockerfile

@@ -63,6 +63,7 @@ WORKDIR /home/docker/data
 ENV HOME /home/docker
 ENV USER docker
 USER docker
+ENV PATH /home/docker/.local/bin:$PATH
 # Avoid first use of sudo warning. c.f. https://askubuntu.com/a/22614/781671
 RUN touch $HOME/.sudo_as_admin_successful