feat: Ability to specify cluster update timeout

[mkilchhofer]

PR o'clock

Description

Our intent is to update our exising EKS cluster with cluster_encryption_config as it was introduced here:

• https://aws.amazon.com/about-aws/whats-new/2021/03/amazon-eks-supports-adding-kms-envelope-encryption-to-existing-clusters/?nc1=h_ls
• https://docs.aws.amazon.com/eks/latest/userguide/update-cluster.html#enable-kms
• https://aws.amazon.com/de/blogs/containers/using-eks-encryption-provider-support-for-defense-in-depth/

Unfortunately updating the cluster with cluster_encryption_config consumes more than 1h (at least in euc1).

As a default I used what's default in the resource aws_eks_cluster: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/eks_cluster#timeouts

Checklist

• README.md has been updated after any changes to variables and outputs. See https://github.com/terraform-aws-modules/terraform-aws-eks/#doc-generation

[daroga0002]

@antonbabenko 👍

[antonbabenko]

Thanks @mkilchhofer for this PR!

v17.20.0 has been just released.

[github-actions]

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