Add gke option

[arhamahmed]

Fixes #30

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[arhamahmed]

I signed it! (CLA)

[googlebot]

CLAs look good, thanks!

[arhamahmed]

@dazuma @hxiong388 I have finished adding the tests and doing some cleanup. Feel free to give the GKE implementation a whirl.

[tmaier]

Any update on this ❔