Appimagekit: Support AppImage in linuxbrew

[emanresusername]

hoping to get some advice/ideas from similar projects on this issue

(please excuse the copypasta 😅 thought this'd be the best combo of efficiency, related-github-repo-synnergy and visibility/discoverability for the relevant communities/contributers/etc)

[probonopd]

Maybe start with the build steps in https://github.com/probonopd/linuxdeployqt/blob/master/README.md#using-linuxdeployqt-with-travis-ci and convert these to the linuxbrew equivalent. Since I have never used linuxbrew, I don't know how to do that though.

[emanresusername]

😮 whoah, i wasn't even thinking about also building the AppImage, that'd make it way more widely useful!
is there any way to do that without needing root (i think one of the things that draws people (at least me and a handful of folks i've encountered 😅) to linuxbrew is being able to use it without being a sudoer)?

[probonopd]

Ah, it's "just" about installing already-existing AppImages, that should be rather easy to do. An AppImage is just an ELF executable like any other Linux application. So they should be totally able to do it.