ci: enable ppc64le wheel

[mgiessing]

This PR enables building ppc64le manylinux wheels on GitHub Actions. It does not introduce any content changes.

[mergify]

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[cau-git]

The ppc64le wheels seems to have succeeded in GitHub CI.

[mgiessing]

Yes, however, both wheels that use emulation take an extremely long time to build—I’m not sure if it would make sense to parallelize them. Also, I noticed that the aarch64 (and now ppc64le) manylinux wheels are being built under the action name "build wheel for py3.X manylinux_x86_64", which seems a bit misleading.

[cau-git]

@mgiessing yes, If we have now two emulated builds it would definitely make sense to split and parallelize. And we can adjust the naming of the build job for these.

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Merge Protections

Your pull request matches the following merge protections and will not be merged until they are valid.

🟢 Enforce conventional commit

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Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?: