💡 Motivation and Context

The release workflow can currently run only from a merged PR with release labels. Adding workflow_dispatch makes it possible to trigger a release manually from GitHub Actions when needed.

This also updates RELEASING.md to document the manual path and the required bump type selection.

💚 How did you test it?

• Reviewed the workflow logic change
• Validated .github/workflows/release.yml parses as YAML

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Added the release label to the PR
• Added exactly one version bump label: bump-patch, bump-minor, or bump-major