[SPARK-31778][K8S][BUILD] Support cross-building docker images#28615

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holdenk wants to merge 4 commits intoapache:masterfrom

holdenk:cross-build

Commits on May 16, 2020

Make the docker image tool support cross building with the new docker buildx command
holdenk
committed

Commits on May 22, 2020

Commits on May 24, 2020

Add a link to how to setup buildx since it's new and most folks probably don't have it enabled already
holdenk
committed