preparing the upgrade of www-master to bookworm: issues building the bullseye release notes (fonts-sil-charis)

Hello all

We're preparing the upgrade of www-master to bookworm (RT #9603). There 
is no xmlroff package in bookworm so I tested the builds of the 
documentation written in DocBook (particularly, release notes for 
bullseye) to see if there is any issue.

I didn't find issues not having xmlroff (indeed, I removed xmlroff from 
my bullseye machine too, and the release notes for bullseye were built 
just fine) but in the bookworm machine I had issues with another 
package: the build of release notes for bullseye complained about not 
finding the "nullfont" font and CharisSIL-R and CharisSIL-BI, even 
having the fonts-sil-charis package installed. I removed it and 
installed the fonts-sil-charis package from the bullseye suite and the 
release notes for bullseye built fine.

I guess that with the new version of fonts-sil-charis the fonts should 
be named differently in the .dbk files (CharisSIL-Regular and 
CharisSIL-BoldItalic, see e.g. 
https://salsa.debian.org/ddp-team/debian-faq/-/commit/cdc7bc5f69311b36a0b56a10b1c54cf594eedd0a 
), I have no idea about the fix for the "nullfont" issue but it seems 
that fixing the other ones, this also disappears.

I am not sure about the best path to follow, maybe just disable the 
builds of release-notes for bullseye when we upgrade www-master to 
bookworm? (We would still offer the already built files but I'm not sure 
about the lifecycle of the release notes and possible changes/updates 
during LTS).

Kind regards,