Support re-using existing cert-manager on cluster

modules/core/opentelemetry-operator/main.tf

@@ -1,5 +1,6 @@
 module "cert_manager" {
   source = "github.com/aws-ia/terraform-aws-eks-blueprints/modules/kubernetes-addons/cert-manager"
+  count  = var.enable_cert_manager ? 1 : 0
 
   helm_config   = { version = "v1.8.2" }
   addon_context = var.addon_context

modules/core/opentelemetry-operator/variables.tf

@@ -20,6 +20,11 @@ variable "addon_context" {
   })
 }
 
+variable "enable_cert_manager" {
+  type    = bool
+  default = true
+}
+
 variable "kubernetes_version" {
   type = string
 }