Output IAM role arns created by nodegroup submodules (iam_role_arn)

[tculp]

Is your request related to a new offering from AWS?

No

Is your request related to a problem? Please describe.

Updating or overwriting the aws-auth configmap is difficult without having easy access to which roles are used/created for the nodegroups.

Describe the solution you'd like.

An output by the eks parent module that provides a list of all nodegroup roles.

Describe alternatives you've considered.

• Using a data source to pull role names
• Manually copy role arns
• Create node groups separately using the submodule directly (not preferred)

Additional context

This could also help satisfy #1744 and #1901

[bryantbiggs]

you can see how to do this here https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/outputs.tf#L169-L179
or feel free to use the already formatted configmap and add in any additional roles/groups/etc. before consuming downstream

[github-actions]

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