ci: fail the build when Coverity finds defects

[orbalayla-nvidia]

Coverity has been running in the per-PR pipeline but only printing its findings, so a security defect could never fail a build.

The defect count is now zero real findings (it was 5 before the autoescape fix in #1047), so there is no pre-existing debt to baseline against and no Coverity stream is needed — anything reported from here was introduced by the change under test.

Changes

• Gate: parse the Defect occurrences found count out of cov-analyze and exit non-zero if it is not zero. Archives coverity-analyze.log alongside coverity.log.
• Suppress one false positive: test_python_environment.py asserts env.venv_path is None after uninstall(). Coverity cannot see that uninstall() clears the attribute, so it reads the assertion as a redundant null check after a dereference. Annotated with # coverity[check_after_deref] at the source rather than loosening the gate or excluding tests/ from the scan.

Notes

False positives are suppressed at the source on purpose — excluding tests/ wholesale would stop Coverity watching test helpers, and a per-site annotation documents why each one is not a real defect.

This PR gates itself: its own Coverity stage has to come back clean for the check to pass.

Refs: HPCINFRA-4858

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📝 Walkthrough

Walkthrough

The Coverity job captures cov-analyze output, fails if the defect-occurrence summary is missing or its count is nonzero, and archives both Coverity logs. A test comment describes a Coverity analyzer warning about venv_path.

Changes

Coverity Analysis Gate

Layer / File(s)	Summary
Analysis gate and warning annotation .ci/job_matrix.yaml, tests/core/installables/test_python_environment.py	The Coverity job captures cov-analyze output, requires a defect-occurrence summary, and fails if the summary is missing or the parsed count is nonzero. It archives both Coverity logs. A test comment states that the analyzer does not recognize that uninstall() clears venv_path.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 63134

The Coverity job now reliably fails on missing or nonzero defect results while retaining both diagnostic logs. No actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: making the CI build fail when Coverity finds defects.
Description check	✅ Passed	The description explains the Coverity defect gate, log archiving, and the false-positive suppression, all of which match the changeset.
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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Inline comments:
In @.ci/job_matrix.yaml:
- Around line 123-124: Update the defects-count extraction in the Coverity job
so a grep no-match sets defects to zero without failing under pipefail.
Distinguish grep status 1 from file-read errors, preserving the latter as
failures; keep the existing count parsing for matches.

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