Nearly reproducible Bookworm 12.6 live images

Hello lists,

I'm sooo close...

Now that that 12.6 live images have been generated [1], there is only 
one embedded timestamp left (/boot/grub/live-theme/theme.txt and its 
parent folder)
I've not seen this timestamp issue before, as I am using a slightly 
different way of building the image than live-setup uses.

live-setup uses a local cache of the git repository of live-build, to 
avoid being blocklisted by salsa for heavy traffic, caused by parallel 
builds.
This local cache brings that this file could have an old timestamp, 
whereas my local builds always used 'now' (caused by git clone), which 
would be properly truncated to SOURCE_DATE_EPOCH, and therefore be 
reproducible.

I'll prepare a patch, and hopefully the next set of live images (12.6.1 
or 12.7.0) will be fully reproducible.

With kind regards,
Roland Clobus

[1] https://get.debian.org/images/release/current-live/amd64/iso-hybrid/

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