GKE : Move boot_disk_kms_key to GA

[steffencircle]

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Description

Both Container Cluster resources offer the paramter `boot_disk_kms_key', which allows to specify a Key ID for Customer-Managed Encyrption Keys.
At the moment only the google-beta provider allows to configure that paramter but according to the Google Docs this parameter is fully GA.

New or Affected Resource(s)

• google_container_cluster
• google_container_node_pool

[github-actions]

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