feat(training/quickstart): add self-contained training demo

[dmarx]

This PR publishes an sbatch script which can be used to launch a "self-contained" training demo. The main role of this demo is for debugging and smoke testing. As such, it's sort of an odd fit for the reference-architecture repo because it actually illustrates an anti-pattern: shipping training data packaged into the container. This is useful for the expedient purpose this container is generally used for, but we might want to hold off on merging to main until after adding a reference example for training that doesn't demonstrate the anti-pattern.

[bradbeam]

I love the concept here. Is there much of a lift needed to make this work for gh200?

[bradbeam]

shipping training data packaged into the container.

Could we make use of a public bucket instead?