ci: arm64-only failures do not trigger Slack notification (matrix fan-in needed)

[coderabbitai]

Summary

In the current matrix CI workflow (PR #287), the Slack notification steps (Set Slack notify status / Notify Slack) are gated on matrix.arch == 'amd64' and evaluated entirely within the amd64 matrix leg. Because failure() in GitHub Actions is job-scoped, an arm64-only failure leaves the amd64 context unaffected — no Slack alert fires.

Expected behavior

Failures in any matrix architecture (amd64 or arm64) should trigger a Slack notification.

Suggested fix

Add a dedicated fan-in job (e.g., notify-slack) that:

1. needs the full matrix job (build-test-push).
2. Runs with if: always().
3. Inspects needs.build-test-push.result (or needs.*.result) to detect any failed architecture.
4. Passes the aggregated publish/failure status to the Slack notify script once, replacing the per-leg notification logic.

References

• PR: ci: add multi-arch matrix with MaaS vLLM for ARM64 testing #287
• Review comment: ci: add multi-arch matrix with MaaS vLLM for ARM64 testing #287 (comment)
• Requested by: @Artemon-line

[nathan-weinberg]

@Artemon-line i believe your PR should fix this now yes?

[github-actions]

This issue has been automatically marked as stale because it has not had activity within 60 days. It will be automatically closed if no further activity occurs within 30 days.

[github-actions]

This issue has been automatically marked as stale because it has not had activity within 60 days. It will be automatically closed if no further activity occurs within 30 days.