[GKE] Support autoscaling

[hashibot]

This issue was originally opened by @thecodeassassin as hashicorp/terraform#8605. It was migrated here as part of the provider split. The original body of the issue is below.

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hey all,

Google cloud supports autoscaling for nodes which is very useful in high traffic kubernetes deployments. Could you add this feature to terraform? Currently i use local exec like this:

  # enable autoscaling
  provisioner "local-exec" {
      command = "gcloud container clusters update ${var.google_container_cluster.name} --enable-autoscaling --min-nodes=${var.min_nodes} --max-nodes=${var.max_nodes} --project='${var.project_name}'"
  }

Documentation is here
https://cloud.google.com/container-engine/docs/clusters/operations

[ghost]

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