[CI] refactor release pipeline config into groups

[Harry-Chen]

Purpose

The current release pipeline has too many steps and is a little bit hard to read and maintain. This PR puts steps into some groups without changing the actual jobs.

Specifically, it also removes the block before the CUDA 13.0 release image build steps, as requested by @wangshangsam ( #32522 (comment)).

Test Plan

Tested by CI.

Test Result

Pending...

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[gemini-code-assist]

Code Review

This pull request refactors the Buildkite release pipeline configuration for better readability and maintainability. The changes primarily involve organizing the pipeline steps into logical groups, such as building wheels, building Docker images, and publishing artifacts. This makes the pipeline structure much easier to understand. The dependencies between jobs have been preserved, with some being improved by depending on entire groups of jobs. Additionally, a manual block for triggering CUDA 13.0 image builds has been intentionally removed to automate that part of the process. The refactoring is well-executed and improves the clarity of the release pipeline without introducing any apparent issues.

[Copilot]

Pull request overview

Refactors the Buildkite release pipeline YAML to improve readability by grouping related steps, and removes the manual block gating the CUDA 13.0 release image builds.

Changes:

• Grouped wheel build steps under “Build Python wheels”.
• Grouped Docker image build/publish steps into “Build release Docker images” and “Publish release images”.
• Grouped wheel publishing steps under “Publish wheels” and simplified dependencies to reference the wheel-build group.

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[Harry-Chen]

I have triggered a release pipeline run at: https://buildkite.com/vllm/release/builds/12166

[khluu]

LGTM!

[wangshangsam]

Thanks a lot, @Harry-Chen !