Summary

GitHub-hosted runners 2.334.0+ unpack the runner under a version-namespaced subdirectory:

• New: /Users/runner/actions-runner/cached/<version>/_diag/
• Old: /Users/runner/actions-runner/cached/_diag/

GithubCIEnvironmentReader only knew about the pre-2.334.0 layout, so on newer SaaS runners it couldn't locate the Worker_*.log files and failed to derive the GitHub check_run_id.

Changes

• Replace the literal SaaS path with the globstar pattern cached/**/_diag — ** matches zero or more path segments, so a single entry covers both layouts.
• Add a small expandGlob/expandGlobSegments helper that resolves ** at lookup time and returns only existing directories. URLs without ** are passed through unchanged, so the self-hosted literal path and test-injected tempDirs keep working.

JIRA: https://datadoghq.atlassian.net/browse/SDTEST-3796

Test plan

• testGithubCIJobLogFile passes (test injects a non-glob tempDir, which short-circuits to identity).
• Standalone verification against a fake cached/_diag + cached/2.334.0/_diag + cached/junk/ layout: both _diag variants are matched; junk/ (no _diag underneath) is correctly excluded.
• CI run on a 2.334.0+ runner confirms check_run_id is extracted and step-level tagging works end-to-end.

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