Add aarch64 build

[AlexanderWells-diamond]

Draft PR to test CI builds of aarch64

[codecov]

Codecov Report

Merging #122 (0e40396) into master (63995ce) will not change coverage.
The diff coverage is n/a.

❗ Current head 0e40396 differs from pull request most recent head ce88654. Consider uploading reports for the commit ce88654 to get more accurate results

@@           Coverage Diff           @@
##           master     #122   +/-   ##
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  Coverage   87.15%   87.15%           
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  Files          14       14           
  Lines         981      981           
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  Hits          855      855           
  Misses        126      126           

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[github-actions]

Unit Test Results

0 files   -      15  0 suites   - 15   0s ⏱️ - 29m 44s
0 tests  -    249  0 ✔️  -    243  0 💤  -     6  0 ❌ ±0 
0 runs   - 3 735  0 ✔️  - 3 295  0 💤  - 440  0 ❌ ±0 

Results for commit d7262fd. ± Comparison against base commit 63995ce.

[Araneidae]

Possible good news for the future: https://github.blog/changelog/2023-10-30-accelerate-your-ci-cd-with-arm-based-hosted-runners-in-github-actions/ ?

[AlexanderWells-diamond]

There are now arch64 runners available publicly: https://github.com/actions/partner-runner-images

I made an attempt as part of PR #198 to add these runners, but neither Windows or Ubunutu runners worked easily. Problems included:

• cibuildwheel wouldn't accept the platform as valid (probably as it was using an old version of cibuildwheel)
• Some platforms ran all the way through to the end of the tests, but crashed somewhere in pytest's cleanup.
• Some platforms try to compile numpy! Probably something to do with how we retrieve the wheels.

I'll leave this PR open as a reminder to come back to it eventually...