Adding the pull behind a feature flag until it's fully implemented

Refs: FC-0012 OEP-58

Auto-adding PRs to the Github project is not working because the
github-token is not available there.

2

 => [minimal  7/19] RUN echo "{}" > /openedx/config.yml                                                                          0.2s
 => ERROR [minimal  8/19] RUN git clone https://github.com/pyenv/pyenv /opt/pyenv --branch v2.3.36 --depth 1                     0.4s
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 > importing cache manifest from docker.io/overhangio/openedx-discovery:17.0.0-nightly-cache:
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 > [minimal  8/19] RUN git clone https://github.com/pyenv/pyenv /opt/pyenv --branch v2.3.36 --depth 1:
0.341 fatal: could not create work tree dir '/opt/pyenv': Permission denied
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Dockerfile:36
--------------------
  34 |     ENV PYENV_ROOT /opt/pyenv
  35 |     # USER root
  36 | >>> RUN git clone https://github.com/pyenv/pyenv $PYENV_ROOT --branch v2.3.36 --depth 1
  37 |     # Install Python
  38 |     RUN $PYENV_ROOT/bin/pyenv install $PYTHON_VERSION
--------------------
ERROR: failed to solve: process "/bin/sh -c git clone https://github.com/pyenv/pyenv $PYENV_ROOT --branch v2.3.36 --depth 1" did not complete successfully: exit code: 128

The admin's stylesheets e.g.https://{{ECOMMERCE_HOST}}/static/admin/css/base.css, were not loaded because its MIME type appears to be "text/plain", It should be "text/css".