Create models directory under codegate_volume

[ptelang]

Closes #343

[aponcedeleonch]

I read the issue and it's kind of strange. We shouldn't need it. The models folder already should exist when creating the container with the Dockerfile because the folder exists as part of the repository. Basically we copy all of the application (which should include the models directory)

COPY . /app

If we need to create the folder, does that imply that the model we are shipping with the image, all-minilm-L6-v2-q5_k_m.gguf, does not exist?