Add linux-aarch64 support to build scripts

[glikely]

Description

Adds support for building linux-aarch64 (Arm) to the CI scripts. The change matches the configuration used for linux-x86_64 builds.

Motivation and Context

It is useful to use the .github/scripts/build-linux.sh script for building on a local machine, and not just for GitHub actions. By adding AArch64 in this way I'm able to test the Linux build on my M1 MacBook with a Linux VM.

How Has This Been Tested?

Tested on a local M1 MacBook with a Parallels virtual machine running a fresh install of Ubuntu. Also pushed out to GitHub so that Actions can test the other build architectures.

Types of changes

• Tweak (non-breaking change to improve existing functionality)

Checklist:

• [ ] My code has been run through clang-format.
• [X] I have read the contributing document.
• [X] My code is not on the master branch.
• [X] The code has been tested.
• [X] All commit messages are properly formatted and commits squashed where appropriate.
• [ ] I have included updates to all appropriate documentation.

[glikely]

Oops; I included an unrelated commit. I'll respin the branch to correct in a few minutes.