fix cpu/mem variable substitution

Author: oavdeev

modules/metadata-service/ecs.tf

@@ -19,8 +19,8 @@ resource "aws_ecs_task_definition" "this" {
     "name": "${var.resource_prefix}service${var.resource_suffix}",
     "image": "${var.metadata_service_container_image}",
     "essential": true,
-    "cpu": var.metadata_service_cpu,
-    "memory": var.metadata_service_memory,
+    "cpu": ${var.metadata_service_cpu},
+    "memory": ${var.metadata_service_memory},
     "portMappings": [
       {
         "containerPort": 8080,