RHOAIENG-13027: Adding note for chat_template requirement

[syaseen-rh]

Description

Adding note for chat_template requirement (RHOAIENG-12233)

As of vLLM v0.5.5, you must provide a chat template while querying a model using the /v1/chat/completions endpoint. If your model does not include a predefined chat template, you can use the chat-template command-line parameter to specify a chat template in your custom vLLM runtime, as shown in the example. Replace <CHAT_TEMPLATE> with the path to your template.

containers:
  - args:
      - --chat-template=<CHAT_TEMPLATE>
You can use the chat templates that are available as `.jinja` files link:https://github.com/opendatahub-io/vllm/tree/main/examples[here] or with the vLLM image under `/apps/data/template`. For more information about chat templates, see link:https://huggingface.co/docs/transformers/main/chat_templating[Chat templates].

How Has This Been Tested?

Local build

Upstream preview:

Downstream preview:

[aduquett]

LGTM

[RH-steve-grubb]

Looks OK to me.