better naming scheme for linux x86_64 binaries

lately our naming scheme for the artifacts led to confusion so I am planning to rename the musl linux binaries to `gitui-linux-x86_64...` from `0.26` on.

if there is any reason to not do please speak up.

convo about this for context: https://x.com/TheMorningSongs/status/1771291328980107730?s=20