Add arm64 option to releases

[fyr77]

Hi, bewcloud seems like an interesting project!

One thing I have noticed is that there are AppImage releases for both x86_64 and amd64, but I believe these are identical designations nowadays. Is there any meaning to this, or is it perhaps a typo (arm64)?

[BrunoBernardino]

Hi @fyr77 indeed it's not a typo and they're identical. I kept both in case it helped someone for which one of the options didn't work. I do have aarch64 for macOS but had no arm64 option easily available in CI at the time. I should definitely try to build those in and update the dependencies, here, so I'll keep this open for that.

[BrunoBernardino]

I'm closing this over #5.