Deterministically reproducible pdf for Monero GUI guide

[garlicgambit]

There is an ongoing effort to make the Monero GUI deterministically reproducible. The Monero GUI guide pdf is part of the Monero GUI archives. The GUI guide pdf needs to be deterministically reproducible in order to create reproducible GUI archives.

This pandoc issue describes how to generate reproducible pdf files from markdown. You need a recent version of pandoc and texlive (xelatex engine). Probably a version from 2019 or later.

You can set the SOURCE_DATE_EPOCH to:
SOURCE_DATE_EPOCH=0

And set the pdf:trailerid to all 0's.