Build sharktank packages nightly.

[ScottTodd]

Progress on #294. Once this is merged the nightly package builds will start pushing sharktank-{VERSION}-py3-none-any.whl to https://github.com/nod-ai/SHARK-Platform/releases/tag/dev-wheels alongside the existing shortfin wheels.

Tested at https://github.com/ScottTodd/SHARK-Platform/actions/runs/11621153296/job/32364368882 (ignore the push failure at the end, missing a token).

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Note that the 250KB Python wheel can be installed standalone, but actually using it will need version bumps across projects and more work. In particular, I hit

1. Using iree-turbine from pypi:

   from sharktank import ops
   ...
   
   ImportError: cannot import name 'dynamic_dim' from 'torch.export' (/home/nod/dev/scratch/shark-platform/3.11.venv/lib/python3.11/site-packages/torch/export/__init__.py)
   

   That may be fixed by Remove deprecated constraints and dynamic dim support with test fixes iree-org/iree-turbine#233
2. After installing iree-turbine from source:

   from sharktank import ops
   ...
   
       from gguf import GGUFReader, GGUFValueType
   ModuleNotFoundError: No module named 'gguf'
   

Full logs here: https://gist.github.com/ScottTodd/4cd0c343a92375e7fbdaaf37c38bfc06