generate_commits: Allow k- & G-byte-sized commits as well, besides megabytes

Katrin Leinweberrequested to merge
generate-commits-allow-kilo-and-giga-bytes into main

What does this MR do and why?

Change --megabytes input into a more generic --bytes flag, so that k-, M- & B-bytes are possible.

Screenshots, recordings or output 

$ du 1x-1MB-random*/* 3x-123kB-random*/*

1.0M    1x-1MB-random-20251205-63492-nvibzk/8587202144758932
# before, only this was possible with different number

124K    1x-123kB-random-20251205-63692-zp90mi/339184992013543
# now, gls_generate_commits --bytes=123k can be used

How to set up and validate locally

See example command above.

MR acceptance checklist

  • I've tested this change on: macOS /Linux.
  • This change needs no other test and thus no review, because it only changes Ruby-based behaviour within the script. I'll merge it myself.
    • This does need at least 1 additional test on another machine, ideally using a different OS. I've facilitated this via: Slack thread / MR review.
Edited by Katrin Leinweber

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