Setup native and emulated test CI

[mkannwischer]

https://github.com/pq-code-package/mlkem-c-aarch64/pull/22 adds native test.

In addition to that I'd like to add support for cross-compilation and testing in qemu. That should also allow running the tests in the Github CI.
We do have something similar in https://github.com/slothy-optimizer/pqax that could give some inspriation.
There is CI there too: slothy-optimizer/pqax#4

[cothan]

Good idea. After #22 merge I will add a build test, also hashsum to ensure the correctness.

[hanno-becker]

Once we integrate AArch64 assembly, #22 will need updating rather than amending, right?

[hanno-becker]

So, what we want for the test CI is:

• Native tests on AArch64 Linux runners. @ryjones to provide access to BuildJet Arm runners for this.
• Emulated tests on x86 Linux runners. @potsrevennil you're on this, as I understand?
• Native tests on Mac. Done in Wrap up Nix configuration, setup arm64 github runner #44 by @potsrevennil

@mkannwischer Agree?

[potsrevennil]

Hi, yes I'm on emulated tests on x86 linux runners

[mkannwischer]

Yes, that sounds good to me!

[hanno-becker]

• Native tests on AArch64 Linux runners. Done in https://github.com/pq-code-package/mlkem-c-aarch64/pull/49
• Native tests on Mac. Done in https://github.com/pq-code-package/mlkem-c-aarch64/pull/44
• Cross-compilation on x86 Linux runners: Build. Done in Use pre-built cross-compiled aarch64 gcc for x86-64 linux machine #45
• Cross-compilation on x86 Linux runners: Test.