Deploy k8gb on GCP/GKE

[jkremser]

Replicate our steps described in local setup on GCP or Google's managed K8s (gke). Including the

• make test-failover
• make test-round-robin
  (the concepts captured by these Makefile targets)

Deliverables:
pull-request with the results describing the:

• reproduction steps (bash, makefile or markdown)
• issues that had to be solved in order to achieve this (platform specifics)
• all the steps that were necessary to make in the GCP web ui as well as the gcloud ... CLI invocations

NOTE: the files should land somewhere under /docs/platforms/gcp/*

You can use the free tier offering on GCP.

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