Enable ARM builds for linux via emulation

[benhowes]

Closes #6.

This PR adds support for building wheels for aarch64 (arm 64) for linux.

The only downside I can see is that due to emulation, each arm linux build takes approximately 300s, so about 1200s (20 minutes) total extra time for the build.

Testing

Demo of usage in docker on macOS with an M3 chip (arm64 based):

1. Download artifacts from test run: https://github.com/neuronostics/rocket-fft/actions/runs/7450533530
2. Start container: docker run -it --entrypoint bash -v ~/Downloads/artifact:/artifact python:3.11
3. Install correct wheel pip install /artifact/rocket_fft-0.2.2-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
4. Run a test file:

   root@355ff7fa867a:/# cat test.py 
   import numba as nb
   import numpy as np
   
   @nb.njit
   def jit_fft(x):
       return np.fft.fft(x)
   
   a = np.array([1, 6, 1, 8, 0, 3, 3, 9])
   print(jit_fft(a))
   
   root@355ff7fa867a:/# pip freeze
   llvmlite==0.41.1
   numba==0.58.1
   numpy==1.26.3
   rocket-fft @ file:///artifact/rocket_fft-0.2.2-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl#sha256=5cfa60c34480522ca3181ab3c35647630477a5280d58f8ef0dde612fd4341107
   root@355ff7fa867a:/# uname -a
   Linux 355ff7fa867a 6.5.11-linuxkit #1 SMP PREEMPT Wed Dec  6 17:08:31 UTC 2023 aarch64 GNU/Linux
   root@355ff7fa867a:/# python test.py
   [ 31.        -0.j           3.82842712+0.58578644j
     -3.        +8.j          -1.82842712-3.41421356j
    -21.        -0.j          -1.82842712+3.41421356j
     -3.        -8.j           3.82842712-0.58578644j]
   

[styfenschaer]

Hi @benhowes

Thanks a lot for looking into this, and apologize for my delayed response.

The long build time is unfortunate but nothing to worry about. Could you let me know if you've had the opportunity to test the wheel? I plan to package a new release over the coming weekend.

Best
Styfen

[benhowes]

@styfenschaer I've updated the PR with some very basic testing I've just done in a docker container on mac, but happy to look at doing more if you have anything in particular you'd like to see?

[styfenschaer]

I created a new release on TestPyPI. Can you confirm that this works for you? I will then upload it to PyPI too.

pip install -i https://test.pypi.org/simple/ rocket-fft==0.2.3

[benhowes]

@styfenschaer yep, seems to work fine with the same test file as above. Thanks!

[styfenschaer]

Hi @benhowes
The new release is now also on PyPI. Thanks again for your help.

[benhowes]

Thanks for getting this resolved so quickly 👍