[CI/Build] Change CI runner to L4

[Shaoting-Feng]

FILL IN THE PR DESCRIPTION HERE

FIX #xxxx (link existing issues this PR will resolve)

BEFORE SUBMITTING, PLEASE READ THE CHECKLIST BELOW AND FILL IN THE DESCRIPTION ABOVE

---

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• Try to classify PRs for easy understanding of the type of changes, such as [Bugfix], [Feat], and [CI].

Detailed Checklist (Click to Expand)

Thank you for your contribution to production-stack! Before submitting the pull request, please ensure the PR meets the following criteria. This helps us maintain the code quality and improve the efficiency of the review process.

PR Title and Classification

Please try to classify PRs for easy understanding of the type of changes. The PR title is prefixed appropriately to indicate the type of change. Please use one of the following:

• [Bugfix] for bug fixes.
• [CI/Build] for build or continuous integration improvements.
• [Doc] for documentation fixes and improvements.
• [Feat] for new features in the cluster (e.g., autoscaling, disaggregated prefill, etc.).
• [Router] for changes to the vllm_router (e.g., routing algorithm, router observability, etc.).
• [Misc] for PRs that do not fit the above categories. Please use this sparingly.

Note: If the PR spans more than one category, please include all relevant prefixes.

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• Please include sufficient tests to ensure the change is stay correct and robust. This includes both unit tests and integration tests.

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We aim to address all PRs in a timely manner. If no one reviews your PR within 5 days, please @-mention one of YuhanLiu11
, Shaoting-Feng or ApostaC.

[gemini-code-assist]

Summary of Changes

Hello @Shaoting-Feng, 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 seems to be part of an ongoing effort to test or set up the continuous integration (CI) environment. It primarily introduces a utility script for installing Helm, a crucial tool for managing Kubernetes applications, suggesting preparation for deployment-related CI steps. A small, temporary logging change was also made, likely for debugging purposes within the CI runner.

Highlights

• CI/Build Infrastructure: I've identified the addition of a comprehensive shell script (get_helm.sh) designed to automate the installation of the Helm CLI tool. This is a common requirement for CI/CD pipelines that interact with Kubernetes clusters.
• CI Runner Testing/Debugging: A minor, likely temporary, logging statement (logger.info("shaoting test")) was introduced into src/vllm_router/app.py. This change appears to be for debugging or verifying the execution path within a CI runner environment.

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[gemini-code-assist]

Code Review

This pull request introduces a script for installing Helm and includes a test log message in the router application. The review focuses on ensuring the new script is robust and that temporary test code is removed. A critical issue was found in src/vllm_router/app.py where a test log message should be removed. Several high and medium severity issues were identified in the new utils/get_helm.sh script, mainly concerning shell scripting best practices like quoting variables to prevent word splitting and improving error reporting for a better user experience.

[ApostaC]

LGTM