fix(acs-ci): time-limit GCS preflight

[robbycochran]

Bound the sandbox GCS connectivity probe so a proxy or TLS failure produces an artifact promptly instead of hanging the preflight.

Summary by CodeRabbit

• Bug Fixes
  • Added a 30-second timeout to the nightly preflight GCS bucket check to prevent it from hanging indefinitely.

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ℹ️ Recent review info

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Plan: Enterprise

Run ID: fef63de7-728b-42f2-88e4-1b6b80ef7cb8

📥 Commits

Reviewing files that changed from the base of the PR and between 5efe5ca and afbea35.

📒 Files selected for processing (1)

• tasks/acs-ci-nightly/workflow/preflight.yaml

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Walkthrough

The preflight workflow now limits the GCS bucket check to 30 seconds. Timeout failures use the existing nonzero-exit handling.

Changes

GCS bucket check

Layer / File(s)	Summary
Add GCS bucket check timeout tasks/acs-ci-nightly/workflow/preflight.yaml	The GCS bucket check now runs through timeout 30s. Existing exit-status logging and failure handling remain unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to afbea

The GCS preflight is bounded as intended, with timeout failures still reported through the existing failure path.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a time limit to the ACS CI GCS preflight check.
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.

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