Add linux aarch64 wheel build support

[odidev]

Add linux aarch64 wheel build support.

Related to #11 @cher-nov Could you please review this PR?

[cher-nov]

Thank you for contribution and sorry for the delay!

Unfortunately, the repository is now in a non-release condition, as it has been stalled in the midst of the Rust-based version development. I plan to finish it until next year, and then I'll review your PR properly.

[Lonami]

I think CI is working now that #13 was fixed (at least it worked on my test repo). We may try supporting aarch64 again after we polish it up and make sure it all works.

[odidev]

@cher-nov, did you get a chance to look into this PR? Thanks.

[Rongronggg9]

Is there any news on this?
Now that cryptg v0.3 was released and is the initial RIIR-ed release, it is a suitable time to distribute aarch64 wheels along with wheels on other architectures.

RIIR is a piece of good news, meanwhile a piece of bad news. It effectively makes building it on QEMU-simulated aarch64 insanely painful. Typically speaking, despite the setup time of rustup (> 70s), cryptg needs > 700s to build. Previously the time is just 20s.

Why QEMU? GHA only provides amd64 hosted runners.

[Lonami]

I've tried to resolve the conflicts, but since we're now using cibuildwheel, I may do something wrong in the "updating" process. I see cibuildwheel has a section for Building non-native architectures using emulation which includes aarch64 but I'm not sure if there's a particular reason why the old code uses if: ${{ matrix.arch == 'aarch64' }}, whereas their example uses if: runner.os == 'Linux' and with: platforms: all, so I would rather wait on @odidev since they're OP.

However I'm open to another PR with the necessary changes from someone more knowledgeable than me if OP doesn't respond.

[Rongronggg9]

if: ${{ matrix.arch == 'aarch64' }} is indeed a bit weird since there seems to be no disadvantage if we delete this line and replace it with os == Linux

[Lonami]

Maybe it means it only uses qemu for that so the others are faster to build?

[Rongronggg9]

Maybe it means it only uses qemu for that so the others are faster to build?

Nope. Setting up QEMU would not make builds for amd64/x86 using QEMU.