Prefer platform that is currently running for pulling remote images and kaniko binary Makefile target

[PhoenixMage]

Fixes #646 rebase.

I needed this for my arm64 k8s cluster. I have zero Go experience but
enough experience with other things to fix the rebase (I think!). This
patch is working fine on my cluster.

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[PhoenixMage]

@googlebot I signed it!

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[tejal29]

Thanks @PhoenixMage since you had to rebase this multiple times last time you raised this PR, i really want to get this in sooner :)
I fixed the lint error and ran integration tests.