Terragrunt: inputs:

https://terragrunt.gruntwork.io/docs/features/inputs/

inputs = {

aws_auth_extra_roles = <<-EOF
mapUsers: |
 - userarn: arn:aws:iam::XXXXXXXXXXXX:user/your-aws-user
   username: your-k8s-new-user-with-master-privileges
   groups:
     - system:masters
 EOF
}

See also

• Terragrunt [ show | plan | run-all | apply | output | destroy | terragrunt-info | render-json | graph-dependencies | fmt | hclfmt | validate |aws-provider-patch ], Terragrunt: inputs:,terragrunt --help, terragrunt.hcl, tfswitch, Blocks, generate