Log config only on rank zero at `torchtune/recipes/full_finetune_distributed.py`

[kabir2505]

Context

What is the purpose of this PR? Is it to

• fix a bug This PR ensures that log_config is only called on rank zero in distributed runs to avoid redundant logging across devices.

Address: #2700

Please link to any issues this PR addresses.

Changelog

What are the changes made in this PR? - Added a rank check to only log config on rank zero

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UX

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• I did not change any public API

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As of commit 6ace7c26302f0b4c8411ecf68602bc7ee63805da with merge base e5ee1b2fcd25a411a4d0889849c1528189d56616 ():

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[kabir2505]

Hey @SalmanMohammadi @ebsmothers — just to confirm, should config.log_config() be moved to setup()?

[joecummings]

Hey @SalmanMohammadi @ebsmothers — just to confirm, should config.log_config() be moved to setup()?

Correct!