docs(epp): stop pinning vLLM on-ramp version

[JulienDarve]

Summary

Make vLLM image selection explicit in the inference-gateway on-ramp, so the example does not need a new release pin with every vLLM bump.

• Use <VLLM_IMAGE> in the manifest and both before/after examples.
• Document choosing a release tag or digest.
• Require and substitute VLLM_IMAGE and EPP_IMAGE in the deployment command.

Validation

• Release-tag and digest substitutions each rendered nine parseable YAML resources. Missing image variables fail clearly and emit no manifest.
• Pre-commit, docs lint, and Fern configuration checks passed. Fern's link check reports one unrelated broken link already present on main.
• No Kubernetes deployment was run.

Linear: DYN-4206

[github-actions]

🌿 Fern Docs Preview: https://nvidia-preview-01a088a8-df76-7148-8687-4602db2232dc.docs.buildwithfern.com/dynamo/dev

[coderabbitai]

Walkthrough

The on-ramp deployment and Kubernetes documentation examples now use vllm/vllm-openai:latest. The README also advises using a pinned or internally mirrored image for reproducible deployments.

Changes

vLLM image reference update

Layer / File(s)	Summary
Update vLLM image references deploy/inference-gateway/ext-proc/examples/onramp/agg.yaml, deploy/inference-gateway/ext-proc/examples/onramp/README.md, docs/fern/pages/kubernetes/kv-aware-routing/vanilla-vllm-onramp.mdx	The deployment and documentation examples now use the floating latest vLLM image. The README includes guidance for pinned or internally mirrored images.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: 🟡 Moderate · up to 2cf7a

The runnable on-ramp manifest can deploy different vLLM contents over time, reducing reproducibility and potentially introducing unreviewed runtime changes. Pin the image to a release tag or digest before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: removing the pinned vLLM on-ramp version.
Description check	✅ Passed	The description explains the change, implementation details, validation results, and related Linear issue. It does not use all template headings or explicitly identify reviewer starting points, but it…

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@deploy/inference-gateway/ext-proc/examples/onramp/agg.yaml`:
- Line 79: Update the vLLM container image reference in the manifest to use a
specific immutable release tag or digest instead of vllm/vllm-openai:latest,
while preserving the existing container configuration.

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📥 Commits

Reviewing files that changed from the base of the PR and between 797e65a and 2cf7a3a.

📒 Files selected for processing (3)

• deploy/inference-gateway/ext-proc/examples/onramp/README.md
• deploy/inference-gateway/ext-proc/examples/onramp/agg.yaml
• docs/fern/pages/kubernetes/kv-aware-routing/vanilla-vllm-onramp.mdx

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[JulienDarve]

/ok to test 4828b92