[neon] [Bug 381893] Add .VolumeIcon.png neon logo to root of install image

[Harald Sitter]

https://bugs.kde.org/show_bug.cgi?id=381893

--- Comment #3 from Harald Sitter <sit...@kde.org> ---
I rather find this iffy. Putting a single resolution PNG there, means that
either it needs to have substantial resolution 1024x1024+, or be small and then
look terrible on 4K+ resolutions because of up scaling. Both options require
the bootloader to do image scaling :(
Meanwhile the only library to generate apple icns files appears to also lack
@scale variants support if this bug is to be believed
https://sourceforge.net/p/icns/bugs/20/ that's on top of the fact that
apparently the resolution tags in the file format are made up on the spot
meaning proper support for any given resolution requires all involved software
needs to know about it.

All this makes me kinda not want to do this by default TBH. If the bootloader
goes fishing for icons already, they could just as well do it the linux way of
reading LOGO from $disk/etc/os-release and then resolving the icon from
$disk/usr/share/icons/hicolor
https://www.freedesktop.org/software/systemd/man/os-release.html#LOGO=

Mind you, I'm not opposed to putting an icon set in a convenient location, but
a single resolution for multi resolution use cases seems ill advised.

Nevertheless I've even built a thing that could theoretically generate the
volumeicon for us https://invent.kde.org/sitter/kde-volumeicon

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