Feature - Dockerfile Update to Install Python-Modules from local_requirements.txt

[jifox]

This feature implements the installation of additional python modules during invoke build if the file local_requirements.txt exists in project-directory.

[jathanism]

Huh, this is kind of clever, but not sure what this buys us in a container compared to just running if [ -f local_requirements.txt ] ; then pip install -r local_requirements.txt; fi.

Thoughts?

[glennmatthews]

It at least has the small advantage that it stays within the Poetry tool chain instead of mixing Poetry and Pip. I'd want to test this to make sure it doesn't end up modifying the pyproject.toml/poetry.lock in Git, though?

[jathanism]

@glennmatthews Yeah that was my concern, too, I think. I just didn't spell it out. Pretty sure it would update them which might result in breaking layer caching.

[jifox]

I dont think that there can be a changes in source directory during a docker build because no volumes are mounted and the source directory will be copied to container image before executing the installations.

COPY pyproject.toml poetry.lock /opt/nautobot/
WORKDIR /opt/nautobot

RUN poetry install --no-root

COPY . /opt/nautobot

RUN poetry install

[jathanism]

Thanks @jifox ! 🙃