Add support for Ollama backend

[Dadams2]

These are the bare minimum changes. It might be reasonable to also include in the documentation:

• basic setup instructions for ollama. Specifically running the following before using please:

ollama serve

• instructions on a good default model to use with ollama e.g -m llama3.1

I think it is somewhat safe to assume that if a user knows they want ollama they will want to specify a model themselves. This assumption is why I have omitted setting more defaults.

[thomas-endres-tng]

Could you also please sign your commit?

[Dadams2]

of course! please forgive the force push

[ghost91-]

@Dadams2 I know it’s been a while, but you’ll also need to sign off your commit. If you are still interested in getting this merged, you can easily achieve that by running

git rebase -i origin/main --signoff

The conflicts also need to be resolved, of course.

[Dadams2]

@ghost91- Have done!

[thomas-endres-tng]

One question about that - you can already set the url manually. Why do we still need the ollama option?