LilyPond to ePub: how to run LilyPond on the DocBook output?

[Thibaut Cuvelier]

Dear list,

We have received a few requests regarding LilyPond output in ePub (
https://www.lyx.org/trac/ticket/12370, 12371, and 12372). A large part of
the infrastructure is now plumbed with the last few commits I pushed.

The last missing part is the actual rendering of the music sheet. According
to the docs (https://lilypond.org/doc/v2.23/Documentation/usage/docbook),
it should be just calling `lilypond-book` on the generated DocBook file to
have a new DocBook file with the music sheet.

How can we achieve this? I did not see anything related to calling LilyPond
on the existing LaTeX files either, so I can't copy this… Any help would be
appreciated!

All the best,
Thibaut
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