cli version command should report tag

For a build done from a git tag, the libra version command ends up reporting "HEAD" for the branch field. 
I think it should report the tag.

```
$ libra version
LIBRA VERSION 8.0.0
build timestamp: 2025-05-24T03:02:43.189772642Z
git branch: HEAD
git SHA: 061118b977a698c4e31e64d56d1c3ceaf36e8439
git commit timestamp: 2025-05-23T20:37:08.000000000-06:0
```