Upload `lightning_config.yaml` to W&B online run logs for better traceability

[aditya0by0]

Description:
Currently, there’s a filename clash between the config files generated by Weights & Biases (W&B) and PyTorch Lightning CLI:

• W&B automatically generates a file named config.yaml to store hyperparameters and run settings passed for a given run.
• LightningCLI also generates a file named config.yaml (by default) containing the CLI/Lightning configuration for reproducibility.

Since both have similar default names, we changed LightningCLI’s config file name to avoid conflicts:

ChebaiCLI(
    save_config_kwargs={"config_filename": "lightning_config.yaml"},
    parser_kwargs={"parser_mode": "omegaconf"},
)

This prevents overwriting and allows both files to coexist.
However, while lightning_config.yaml is saved locally (inside the W&B run’s files directory), it is not uploaded to the W&B online run logs.

Why this matters:
The lightning_config.yaml contains much more detailed information than W&B’s config.yml — including:

• The classes and subclasses instantiated
• Detailed CLI arguments and defaults
• Model architecture instantiation details
• Extra metadata useful for experiment reproducibility

Having this file in the online W&B run logs would greatly improve:

• Traceability of runs
• Experiment reproducibility
• Collaboration across teams, where others can reconstruct the exact CLI command and configuration
• Also helpful when for debugging and reverse engineering to find certain inconsistencies across runs

Proposed solution:

• Ensure that lightning_config.yaml (or the filename set via save_config_kwargs) is automatically uploaded to W&B run logs, just like artifacts and logs.

[sfluegel05]

This issue has been bugging me for ages. On our Magdeburg server, this was working, but not in Osnabrück and I haven't figured out why yet. So if you can find out how to do this, that would be greatly appreciated.

Probably related: the model checkpoints don't get uploaded to wandb (which, in theory, should be possible).