Update the pr builder to avoid redundant runs

[Malith-19]

Purpose

• $subject

Summary by CodeRabbit

• Chores
  • Optimized GitHub Actions workflow to cancel redundant in-progress runs, improving CI/CD efficiency.

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Note: This release contains only internal infrastructure improvements with no end-user impact.

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[coderabbitai]

Walkthrough

A concurrency block is added to the PR builder GitHub Actions workflow to automatically cancel previous in-progress runs when a new workflow run is triggered for the same pull request, using the workflow name and PR reference as the grouping key.

Changes

Cohort / File(s)	Change Summary
GitHub Actions Concurrency Configuration \.github/workflows/pr-builder\.yml	Added concurrency block with group based on workflow name and PR number/ref, and cancel-in-progress enabled to cancel redundant workflow runs for the same PR

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A concurrency sprint, so swift and true,
Cancels old runs when the new ones brew,
PR pipelines dancing, one step ahead,
Wasting no cycles on work that's dead! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description is largely incomplete, containing only a placeholder Purpose section with '$subject' instead of actual content and missing all other required sections from the template.	Complete the description by filling in the Purpose section with actual details about why the concurrency block was needed, and include relevant sections like Goals, Approach, and others as applicable from the repository template.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a concurrency block to the PR builder workflow to prevent redundant runs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[Malith-19]

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[coderabbitai]

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[Copilot]

Pull request overview

This PR adds concurrency control to the PR builder workflow to prevent redundant workflow runs. When multiple commits are pushed to the same pull request in quick succession, only the latest workflow run will continue while earlier runs are automatically cancelled.

Changes:

• Added concurrency configuration to cancel in-progress workflow runs for the same PR

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