docs: Note how to use the Docker image from within GitLab CI

   $ docker run -it --rm -v /path/to/python-gitlab.cfg:/etc/python-gitlab.cfg registry.gitlab.com/python-gitlab/python-gitlab:latest <command> ...

Usage inside GitLab CI

~~~~~~~~~~~~~~~~~~~~~~

If you want to use the Docker image directly inside your GitLab CI as an `image`, you will need to override

the `entrypoint`, `as noted in the official GitLab documentation <https://docs.gitlab.com/ee/ci/docker/using_docker_images.html#override-the-entrypoint-of-an-image>`__:

.. code-block:: yaml

   Job Name:

      image:

         name: registry.gitlab.com/python-gitlab/python-gitlab:latest

         entrypoint: [""]

      before_script:

         gitlab --version

      script:

         gitlab <command>

Building the image

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