A How-to of a working GCP GKE app demo

[jpantsjoha]

A demo app deployment with external-dns integration on Google Cloud Platform GKE cluster, featuring CloudDNS + User permission mapping

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[njuettner]

Minor nit, other than that lgtm 👍

[njuettner]

@jpantsjoha oh and also please sign the CLA. This is necessary before we can merge it.

[jpantsjoha]

@jpantsjoha oh and also please sign the CLA. This is necessary before we can merge it.

signed it now. CLA done also.

[linki]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jpantsjoha, linki

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