Change build apptainer concurrency group

[mawad-amd]

Motivation

Fix concurrency group so that Apptainer build step always cancels anything that came before.

Technical Details

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull Request Overview

This PR fixes the concurrency group configuration for the Apptainer build workflow to ensure proper cancellation of previous runs.

• Removes the -build suffix from the concurrency group name to align with standard workflow concurrency patterns

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