Fix inventory image build

[vordimous]

This PR updates the Python poetry dependency management and install command to allow the image build to succeed.

Error when building on current head of main:

 => ERROR [builder 6/6] RUN poetry config virtualenvs.create false     && poetry install --no-dev                                                                                1.6s
------                                                                                                                                                                                
 > [builder 6/6] RUN poetry config virtualenvs.create false     && poetry install --no-dev:                                                                                           
1.422 Skipping virtualenv creation, as specified in config file.
1.536 
1.536 The option "--no-dev" does not exist