Add Python build for Linux on ARM architecture

[tomviner]

Summarize your change.

Add support for building wheels for Linux on ARM architecture.

This covers both ARM64 hardware running Linux directly, as well as Docker containers running under other operating systems, such as Docker on MacOS.

Our use case is to speed up installs of the package in Docker running on Apple M1 MacBooks.

See docs https://cibuildwheel.pypa.io/en/stable/faq/#emulation Note there is a time penalty to building this wheel under emulation.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: tomviner / name: Tom V (98921f7083e13a28e25ff0f8190cd66698d2b7ca, 24ab019fe482cd2d0b4088ee85ad301cc8157abe, b5f1c13ed94475b1ef0748c1a3a622298fb4c6ff)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.62%. Comparing base (c0e97b0) to head (24ab019). Report is 25 commits behind head on main.

Additional details and impacted files

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[mmcardle]

👍

[jminor]

This sounds like a good idea. @tomviner can you just double check that this PR doesn't conflict/overlap with this which just landed? https://github.com/AcademySoftwareFoundation/OpenTimelineIO/pull/1789

[tomviner]

This sounds like a good idea. @tomviner can you just double check that this PR doesn't conflict/overlap with this which just landed? #1789

Good point @jminor. I've added some changes to take account of this.

Now we'll see just x86_64 and aarch64 (and not i686) getting built under the Ubuntu wheels.