add AppImage ci

[Twig6943]

This PR adds CI

[ripytide]

I found the reason appimagetool doesn't work without an icon, AppImage/AppImageKit#954.

Regardless, I don't think I want to maintain an AppImage format, when I believe the alternative of using cargo is easy enough. If binary formats are wanted then perhaps we could support cargo binstall again like we did previously, probably using something like cargo-dist or similar to handle to ci for it.

[Twig6943]

What about static binaries uploaded to releases section so people can grab those? (The purpose of this pr was to make it so that you dont need cargo to install this)

[ripytide]

I think cargo-dist supports tar.gz as one of the options on the release section so if that works for you then we could add cargo-dist back again?

[Twig6943]

I think cargo-dist supports tar.gz as one of the options on the release section so if that works for you then we could add cargo-dist back again?

Whilst itd be binaries itd still require user to have another form of cargo installed so yea not really that different from cargo

[ripytide]

I don't think so, you can just download the tar.gz file off the github release page, unzip it and put the resulting binary somewhere on your PATH

[ripytide]

Here's an example: https://github.com/ripytide/metapac/releases/tag/v0.2.10

[Twig6943]

this seems good