chore: apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: fredleger

aws/eks-addon/README.md

@@ -1,8 +1,8 @@
 # eks addons
 
-Deploy a single eks addon to an eks cluster.
-The main difference with the eks-addons module is thta this module give you more control over the addon,
-like setting the an IRSA role or an EKS pod identity role.
+Deploy a single EKS addon to an EKS cluster.
+The main difference from the eks-addons module is that this module gives you more control over the addon,
+such as configuring an IRSA role or an EKS pod identity role.
 
 <!-- BEGIN_TF_DOCS -->
 ## Requirements
@@ -47,5 +47,5 @@ No modules.
 
 | Name | Description |
 |------|-------------|
-| <a name="output_addon_arns"></a> [addon\_arns](#output\_addon\_arns) | The ARNs of the EKS addons |
+| <a name="output_addon_arn"></a> [addon\_arn](#output\_addon\_arn) | The ARN of the EKS addon |
 <!-- END_TF_DOCS -->

aws/eks-addon/eks-addon.tf

@@ -4,6 +4,6 @@ resource "aws_eks_addon" "addon" {
   cluster_name             = var.cluster_name
   configuration_values     = var.configuration_values
   resolve_conflicts        = "OVERWRITE"
-  service_account_role_arn = var.service_account_role_arn ? var.service_account_role_arn : null
+  service_account_role_arn = var.service_account_role_arn != null && var.service_account_role_arn != "" ? var.service_account_role_arn : null
   tags                     = local.interpolated_tags
 }

aws/eks-addon/outputs.tf

@@ -1,4 +1,4 @@
-output "addon_arns" {
-  description = "The ARNs of the EKS addons"
-  value       = aws_eks_addon.addon[*].arn
+output "addon_arn" {
+  description = "The ARN of the EKS addon"
+  value       = aws_eks_addon.addon.arn
 }