fix: update broken CI badge to use GitHub Actions workflow URL

[Rahul-R79]

Closes #N/A

Changes

• Updated the "Build Status" badge in README.md to point to the correct build.yml GitHub Actions workflow.

Flags

• None

Screenshots

BEFORE

AFTER

Related Issues

• None

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
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fix/ci-badge

[Rahul-R79]

Hi @dselman @mttrbrts, this PR fixes the broken CI badge in the README. Ready for review!