tests/functional: skip the sentry test when Yama restricts ptrace

[Reasonable-Solutions]

Afaik sentry has similar handling upstream: https://github.com/getsentry/sentry-native/blob/0.13.5/src/backends/sentry_backend_native.c#L372-L379

Observed as a deterministic nix-functional-tests:sentry failure when building determinate-nix inside an unprivileged CI sandbox on a hardened host (Talos Linux, ptrace_scope=2), while the same derivation builds clean on a workstation with ptrace_scope=1.

Summary by CodeRabbit

• Bug Fixes
  • Improved Sentry crash-test compatibility on systems with restrictive kernel tracing settings by skipping the test when crash dump capture is unavailable.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 7f5fbbc1-acf3-47fd-83c7-d9ab5292adf9

📥 Commits

Reviewing files that changed from the base of the PR and between 3ed5caa and 29f34c5.

📒 Files selected for processing (1)

• tests/functional/sentry.sh

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📝 Walkthrough

Walkthrough

The Sentry crash test now checks /proc/sys/kernel/yama/ptrace_scope and skips when its readable value is at least 2.

Changes

Sentry crash test

Layer / File(s)	Summary
Yama ptrace eligibility guard tests/functional/sentry.sh	The test skips when Yama ptrace_scope is readable and has a value of at least 2.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 29f34

The Sentry functional test now skips only when restrictive readable Yama ptrace settings prevent crash dump capture; no current merge-blocking risk remains.

Suggested reviewers: edolstra

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 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: skipping the Sentry test when Yama restricts ptrace access.
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.

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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