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This pull request builds on top of #187. It adds multi-arch builds as done in Eland nearly one year ago: elastic/eland#615. The main difference is that in Rally we test the image before pushing it. However, this workflow is not supported for multi-arch images: docker/buildx#59. As a workaround, we build a linux/amd64 image first, test it, and then build and push the actual multi-arch image with linux/amd64 and linux/arm64. While it is named linux/arm64, it's supported natively on Apple silicon hardware, such as M1/M2/M3 MacBooks.
To review this, the only relevant commit is 515ce21. I believe this should only be merged after #1871, because it's a different concern, and may need to be reverted independently.