Add Gemma finetune on GPU single node code, dockerfile and kubernetes manifest

[moficodes]

Description

This PR add the python code, Dockerfile and Kubernetes manifests for Finetuning Gemma on GKE with multiple GPUs on a single Node.

Tasks

• The contributing guide has been read and followed.
• The samples added / modified have been fully tested.
• Workflow files have been added / modified, if applicable.
• Region tags have been properly added, if new samples.
• All dependencies are set to up-to-date versions, as applicable.

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• ai-ml/llm-finetuning-gemma/Dockerfile:15, tag gke_aiml_llm_finetune_gemma_single_node_docker
• ai-ml/llm-finetuning-gemma/finetune.py:15, tag gke_aiml_llm_finetune_gemma_single_node_py
• ai-ml/llm-finetuning-gemma/finetune.yaml:15, tag gke_aiml_llm_finetune_gemma_single_node_yaml

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[moficodes]

@bourgeoisor

[bourgeoisor]

Just two small things, the rest looks good

[moficodes]

/retest

[bourgeoisor]

LGTM!