Adds langfuse ec2 and api key to code

infra/ecs_alb/variables.tf

@@ -53,4 +53,9 @@ variable "app_count" {
   description = "Number of tasks to run"
   type        = number
   default     = 1
+}
+
+variable "langfuse_host" {
+  description = "Langfuse host URL"
+  type        = string
 }