Restore support for the linux/arm/v6, linux/ppc64le, and linux/s390x platforms

[mcdonnnj]

💡 Summary

We should restore support for the linux/arm/v6, linux/ppc64le, and linux/s390x platforms in this project.

Motivation and context

Support for the linux/arm/v6, linux/ppc64le, and linux/s390x platforms was dropped in # because they were pushing the GitHub Actions workflow past the runtime limit of six hours. Since we need to be able to successfully build and push this image it made sense to drop support for esoteric platforms if that is enough. However, since these platforms are supported by the base Docker images we use, it makes sense to restore support in the future if we are able.

Acceptance criteria

• The linux/arm/v6, linux/ppc64le, and linux/s390x platforms are restored.
• The image build and push finishes within the time allowed for GitHub Actions runners.