Add arm support

[ForBai]

Is your feature request related to a problem? Please describe.
So i got a Raspberry P4 that i use as kind of a "home server" and i wanted to use xxh for it but then i found out the xxh binary doesnt support arm

Describe the solution you'd like
Add a build/release for arm so xxh can be used on arm devices (ex. Raspbarry Pi)

Describe alternatives you've considered
none

Additional context
-bash: ./xxh: cannot execute binary file: Exec format error

For community:
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[anki-code]

hi! There is a report about that it's possible to run AppImage on arm. Also there is xxh AppImage build script. This is a good start to trying build xxh AppImage for arm. PR or report about the result is welcome!

[ForBai]

so after doing a bit of research i found out that because of python-appimge we need to wait till they release a manylinux version that supports arm and if the release we just need to add a another build in the dockerfile with the parameter
-l manylinuxVERSION_aarch64l and then replace VERSION with the manylinux version that works

[anki-code]

I see you already bumped niess/python-appimage#7
Thank you for pushing this forward @ForBai !