[Feat]: Add support for chatTemplates

[mahmoudk1000]

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[gemini-code-assist]

Summary of Changes

Hello @mahmoudk1000, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new feature to the VLLMRuntime Kubernetes operator, enabling seamless integration of custom chat templates with VLLM models. By allowing users to define a chatTemplate within the VLLMRuntime custom resource, the operator automates the process of storing this template in a ConfigMap and configuring the VLLM deployment to utilize it, thereby simplifying the deployment and management of models requiring specific conversational structures.

Highlights

• CRD Extension: The VLLMRuntime custom resource definition (CRD) has been extended to include a new chatTemplate field under spec.model, allowing users to specify chat templates directly in their resource configurations.
• ConfigMap Management: The controller now automatically creates, updates, and manages a Kubernetes ConfigMap to store the provided chatTemplate string, ensuring it's available for the VLLM deployment.
• VLLM Integration: VLLM deployments are now configured to mount the chat template ConfigMap as a file (/etc/chat-template.json) and use it by passing the --chat-template argument to the VLLM server, enabling custom chat formatting.

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[gemini-code-assist]

Code Review

This pull request introduces support for chatTemplates by creating and mounting a Kubernetes ConfigMap. The implementation is mostly sound, but I've identified a few issues that should be addressed. My feedback focuses on correcting a potential resource leak by adding a missing owner reference, improving error handling to prevent silent failures and infinite requeue loops, and enhancing maintainability by suggesting the use of constants instead of hardcoded strings. Addressing these points will make the new functionality more robust and easier to maintain.