[abd3-13]

Added instructions for building Sigil on Alpine Linux.

[dougmassay]

I understand if you want to leave the PySide6 module installation stuff as it currently is for those distros that don't provide it. But you might want to explicitly mention if Alpine does or doesn't provide it. But I see no mention of the extra Pillow module installation that is also a part of Sigil's "standard" list of included Python modules that will need to be available for existing plugins.

It's important for existing 3rd-party plugins to work that all of the recommended modules be available

[abd3-13]

I see, i did installed Pillow and slide when i built it on alpine, i did the changes with the corresponding packages mentioned on debian, updated now

do let me know if any other missing, i will as well spin new alpine and follow the instruction and build a new, to check

[dougmassay]

Thanks!