Access to AWS AArch64 runners

[hanno-becker]

Relates to: #55

AWS Graviton2 and Graviton3 instances are among the current benchmarking targets for MLKEM-C-AArch64 (see README for the others, though note this list may still evolve).

The purpose of this issue is to track if/how we could provide access to AWS Graviton-based runners for MLKEM-C-AArch64 in particular, or the PQCP the general.

[hanno-becker]

Tagging @ry who has done some initial investigation here.

[ryjones]

Hi,
I have the AWS account and credit card; I need someone to work with me on setting up the IAM roles etc.

I plan to use this action but I am a newbie when it comes to setting up AWS accounts.

[planetf1]

@hanno-becker I believe this is now complete and setup for aarch64 as per the update in the last TSC.?

[hanno-becker]

@planetf1 Yes!