google_container_cluster add support for selecting gateway api channel when creating or updating a GKE cluster

[tuunit]

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Description

If you want to use the new Gateway API Controller inside your GKE clusters you need to be able to define a channel to be used. By default no channel is selected, therefore the GKE Gateway Controller does not install the necessary CRDs and the GatewayClasses. I would like to raise a pull request for this feature to be added.

New or Affected Resource(s)

• google_container_cluster

Potential Terraform Configuration

resource "google_container_cluster" "with_gateway_api_config" {
	name               = "my-cluster"
	location           = "us-central1-f"
	initial_node_count = 1
        release_channel {
               channel = "RAPID"
        }
	gateway_api_config {
		channel = "CHANNEL_STANDARD"
	}
      
}

References

Gateway API Documentation: https://cloud.google.com/kubernetes-engine/docs/concepts/gateway-api
SDK Documentation: https://cloud.google.com/sdk/gcloud/reference/container/clusters/create#--gateway-api
GOlang Reference: https://pkg.go.dev/google.golang.org/api/container/v1#GatewayAPIConfig

[tuunit]

I already implemented a solution and I'm currently running the test suite and will raise a PR in the magic-modules repository shortly.

[tuunit]

Resolved in: GoogleCloudPlatform/magic-modules#6875

[github-actions]

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