Add a github workflow to convert top huggingface models

[bergwolf]

We can upload the converted models to ghcr.io and new users would have a place play with ModelPack easily.

There is an E2E test action that shows how the upload can be done.
https://github.com/modelpack/modctl/blob/main/.github/workflows/e2e.yml

[avinashsingh77]

@bergwolf Can you try assigning this one to me?