ci: Attempt to add aarch64 osx build to CI

[kumy]

Add target aarch64-apple-darwin as done in sharkdp/fd#1552

Fix: #17
🤞

[dimo414]

Thank you! It looks like it works on my mac (after I ran xattr -d com.apple.quarantine ... as suggested here). You can grab it from the CI job here if you'd like to confirm as well. I'm assuming the need to bypass the quarantine is expected given that the binary isn't signed or anything like that.

[kumy]

Thanks. I don't own such hardware. I will ask my colleague on Monday to test it if/when he can :)

[dimo414]

Don't worry about it, thanks for the PR!