NH-12708 Add ARM support

[tammy-baylis-swi]

Summary

Adds infra for ARM-compatible (aarch64) wheel builds and install tests.

Example builds

Testrelease 0.7.0.4 with sdist, x86_64 manylinux wheels, and aarch64 manylinux wheels on

TestPyPI: https://test.pypi.org/project/solarwinds-apm/0.7.0.4/#files
PackageCloud: https://packagecloud.io/solarwinds/solarwinds-apm-python

I will test updated PyPI publish with the next APM release.

Install tests using 0.7.0.4 from TestPyPI and PackageCloud pass:

• https://github.com/solarwindscloud/solarwinds-apm-python/actions/runs/4148267865
• https://github.com/solarwindscloud/solarwinds-apm-python/actions/runs/4148269325

Key changes

1. build_publish_sdist_and_x86_64 GH jobs continue to build and upload x86_64 wheels and the sdist to TestPyPI or PyPI, using manylinux_2_28_x86_64.
   • sdist now contains both x86_64 and aarch64 liboboe .so files.
2. New build_publish_aarch64 GH jobs use QEMU and manylinux_2_28_aarch64 to build aarch64 wheels and upload to TestPyPI or PyPI.
3. Fixed PackageCloud build workflow, plus also builds and uploads aarch64 wheels.
4. Hardcodes some aarch64, QEMU-run cases to Verify Installation workflow, as we are working on setting up self-hosted ARM test runners to replace these later.
5. Replaced "x86_64" in builds and install tests with a new, required PLATFORM environment variable (one of: "x86_64", "aarch64").
6. Replaced local build/dev container with two: x86_64 or aarch64.
   • run_docker_dev.sh and Dockerfile are replaced by a docker-compose to run either container locally with PLATFORM and manylinux image set accordingly.
   • See also updated CONTRIBUTING.md.
7. Added a separate README.md for running install test containers locally (e.g. on own Intel MacBook, or EC2 AARCH64 instance). Could alternatively add this to CONTRIBUTING.md.

The GH workflows using QEMU are slow but they seem to work and are less of a security concern than using uraimo/run-on-arch-action.

Please let me know if any suggestions!

[tammy-baylis-swi]

Oh no, Python 3.10 unit tests for "AO prod" failing 😑 Having a look

EDIT: Yay fixed

[raphael-theriault-swi]

LGTM, probably worth getting another pair of eyes given the size though