Specify repo_path while fetching the dummy model

[DhanshreeA]

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• Have you followed the guidelines in our Contribution Guide
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Description

CircleCI test seems to be failing with the new feature that integrates ersilia-pack/fastapi into ersilia. This is possibly because with this change, now ersilia CLI cannot easily fetch models that on your system without repo-path which is required to decided which way to "pack" the model (ie with bentoml or ersilia pack)

Changes to be made

Specify repo_path flag in ersilia fetch command in the CI test config.

Status
Done, to run the test in CI