Add ppc64le Dockerfile and CI workflow support #23
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Summary
This PR adds ppc64le support to the manylinux / musllinux image build infrastructure by introducing a ppc64le-specific Dockerfile and updating the CI workflow to build and publish these images. These images will later be used in h5py to enable wheel builds for the ppc64le architecture.
Changes in this PR
Purpose
These Docker images will be consumed in a follow-up PR in the main h5py repository to enable CI and wheel builds for ppc64le using GitHub Actions.
Note: The ppc64le image build was validated on our self-hosted ppc64le GHA runner.
When h5py later enables ppc64le CI (see h5py/h5py#2683), the project will need to
install our GHA App to access these runners.