fix(ci): keep arm64 lane off pull requests

[yordis]

• Avoid spending ARM64 runner time on every pull request when the lane is intended for protected branch and release confidence.
• Keep PR feedback focused on faster validation while preserving ARM64 coverage for master and release publishing.

[cursor]

PR Summary

Low Risk
CI trigger and concurrency metadata only; no application or build script logic changes.

Overview
Ubuntu LTS ARM64 no longer runs on pull_request; it still runs on push to master, release/v*, and version tags (with the same paths-ignore rules).

The workflow concurrency group is simplified from workflow + (PR number || ref) to workflow + ref, which matches a push-only trigger.

^{Reviewed by Cursor Bugbot for commit ec76d94. Bugbot is set up for automated code reviews on this repo. Configure here.}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 15e05840-c5b8-4b0c-b078-c47a5dfa41de

📥 Commits

Reviewing files that changed from the base of the PR and between b87b661 and ec76d94.

📒 Files selected for processing (1)

• .github/workflows/build-ubuntu-lts-arm64.yml

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Walkthrough

The Ubuntu LTS arm64 workflow now runs only on push events, and its concurrency group now uses github.ref directly.

Changes

Workflow trigger and concurrency

Layer / File(s)	Summary
Push trigger and concurrency .github/workflows/build-ubuntu-lts-arm64.yml	The workflow removes the pull_request trigger block and changes concurrency.group to use github.ref directly.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 I hopped through the workflow gate,
Push-only winds now set the state.
Branches hum in tidy lines,
Concurrency now neatly shines.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly reflects the main CI change: keeping the ARM64 lane off pull requests.
Description check	✅ Passed	The description is directly related to the change and explains why ARM64 runs are being limited on pull requests.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/fix-arm64-pr-trigger

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