ColorImageTag is colorize image tag.

GetBinUnit defines unit for usage (Binary prefix) If multiple options are selected, returns a biggest unit.

GetImageUsage returns total image size and count.

GetSiUnit defines unit for usage (SI prefix) If multiple options are selected, returns a biggest unit.

JoinTab joins string slice with tab.

SetPercentageColor returns colored string percentage < warn : Green warn < percentage < crit : Yellow crit < percentage : Red.