Improve error message for AlmaLinux

[vicaya]

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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!"