update 1: A few notes for those working with Docker:
Modify the Dockerfile provided by plone.docker (unless you don't need to)
For my use case I slightly modified the file. For my usecase I modified my buildout.cfg to remove a lot of extras and created a docker.cfg file.
Then altered my buildout line in the Dockerfile to use docker.cfg instead of buildout.cfg
COPY docker.cfg /plone/instance/docker.cfg
... snip...
&& sudo -u plone LIBRARY_PATH=/lib:/usr/lib bin/buildout -v -c docker.cfg \
Beware of the pypi http vs https issue
Add this to your buildout.cfg/docker.cfg (or equivalent file)
index = https://pypi.python.org/simple
It fixes this issue: