Add the OIDC provider ARN to outputs (#653)

outputs.tf

@@ -63,6 +63,11 @@ output "kubeconfig_filename" {
   value       = concat(local_file.kubeconfig.*.filename, [""])[0]
 }
 
+output "oidc_provider_arn" {
+  description = "The ARN of the OIDC Provider if `enable_irsa = true`."
+  value       = var.enable_irsa ? aws_iam_openid_connect_provider.oidc_provider[0].arn : null
+}
+
 output "workers_asg_arns" {
   description = "IDs of the autoscaling groups containing workers."
   value = concat(