ci: add concurrency to build workflow

[Shubh-Raj]

Closes #638

Changes

• Added concurrency configuration to .github/workflows/build.yml.
• Configured the concurrency group to be ${{ github.workflow }}-${{ github.ref }}.
• Set cancel-in-progress to true to cancel outdated builds on the same branch.

Flags

• This change will automatically cancel running build workflows if a new commit is pushed to the same branch while a build is in progress.
• This is intended to save CI resources.

Related Issues

• Issue Add Workflow Concurrency to Save CI Resources #638

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests (N/A - CI configuration)
• Commits messages follow AP format
• Extend the documentation, if necessary (N/A)
• Merging to main from feat/workflow-concurrency