Reliance on apt-key which has been removed in Debian Trixie

[niansa]

Attempting to build using appimage-tool results in this error on Debian Trixie: appimagebuilder.utils.shell.CommandNotFoundError: Could not find 'apt-key' on $PATH.
apt-key had previously been deprecated and is now gone.

[JoeLoginIsAlreadyTaken]

It looks like the issue can be bypassed by creating a empty but executable fake "apt-key" somewhere in the path.

Then it works with:
sourceline: "deb [arch=amd64 signed-by=/usr/share/keyrings/debian-archive-keyring.gpg] http://deb.debian.org/debian trixie main contrib non-free-firmware"

"apt-key" is not used but still tested to be there, which causes the error.