ci(github): limit GPU test steps to 10 minutes

[SigureMo]

What

Limit GPU unit tests and each of the two GPU integration test cases to 10 minutes of test execution.

Why

GPU unit tests normally take about 6 minutes. A tighter execution limit catches hangs and unexpected runtime regressions sooner. Relates to the runtime regression reported on PR #273.

How

Set timeout-minutes: 10 on Run unittest and Run integration test. Each integration matrix job gets its own limit. Image preparation and GPU acquisition retain their separate budgets, and the existing cleanup and artifact steps run after a test timeout.

Testing

• pre-commit run --all-files --show-diff-on-failure
• git diff --cached --check
• GPU unit and integration tests were not run locally because they require the H20 runner hardware; they will run in PR CI.

Type of Change

• CI/CD or build changes

^{This PR is co-authored with @codex (gpt-6 astra xhigh)}

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-22T11:05:09.632180Z	3528bf5	PR opened

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[rai-studio-bot]

Nyanpasu 审查看板

审查状态： ✅ 已通过

审查版本： 3528bf5e5a6685ed66a35e92b0f2f82b6b8803d8

已完成审查并提交通过，未发现需修改的问题。已核对超时范围、清理路径和近期成功运行耗时；pre-commit 已通过，其余 CI 尚在运行。缺少 H20 硬件，未在本地运行 GPU／多节点测试或实测超时清理。

没有未解决的审查问题。

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[rai-studio-bot]

审查通过，未发现需要修改的问题。已核对两个工作流的测试步骤、集成矩阵、容器清理和设备释放路径；配置符合 GitHub 的步骤超时语义。最近一次 main 的 GPU 单测耗时 6 分 37 秒，两项集成测试分别为 6 分 13 秒和 5 分 59 秒。

本地 diff 检查通过；本 PR 的 pre-commit 已通过，其余 CI 仍在运行。本地未运行 GPU／多节点集成测试，因缺少所需 H20 硬件；未实测超时触发后的清理。

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