Use the list endpoint instead of ps to get ollama's models

[geronimo]

What does this PR do?

Change the endpoint used to determine what models are available in ollama from /api/ps to /api/tags

• Addresses issue Ollama inference issue - llama3.2 not registered #332

Feature/Issue validation/testing/test plan

To reproduce the problem observed in the issue above:

• Start the ollama server (ensure there are compatible models installed)
• Ensure there is no current process running any model with ollama ps
• Start the llama-stack server and no model will be found, although the models are usable in ollama

After the change, there is no need to have a process running the models in Ollama. It'll pick them up anyway.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Ran pre-commit to handle lint / formatting issues.
• Read the contributor guideline,
  Pull Request section?
• Updated relevant documentation.
• Wrote necessary unit or integration tests.

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[ashwinb]

change /api/ps to /api/tags

you say /api/tags/ but in the code the change is client.list() -- is that intended?

[geronimo]

change /api/ps to /api/tags

you say /api/tags/ but in the code the change is client.list() -- is that intended?

@ashwinb, correct, in the ollama client, the list method actually uses the /api/tags/ endpoint. Here is the source.

[aidando73]

I've given this a try and it works for me.

It's nice since don't need to run ollama run $OLLAMA_INFERENCE_MODEL --keepalive 60m every hour or if you switch models