Distribute docker-machine on s390x and ppc64le in Runner Docker image

In !2263 (merged) we added support for the s390x platform on our Runner Docker image, however docker-machine did not support the linux/s390x architecture. Once there is official support for the architecture, we should update the project to include docker-machine in the Runner Docker image.

Also in !2868 (merged) we are adding support for ppc64le architecture for the runner and docker-machine support is also not available on that platform.