Improve error message for AlmaLinux

AlmaLinux 9 minimal which seems to be a fairly common distro, doesn't have tar installed by default. Running yabs would result in a cryptic "Geekbench \<version\> failed. Run manually to determine cause.".

Just add a one liner to check for tar would help saving people some time:
```
type tar > /dev/null || echo "Missing required tar command!"
```