[DPC-5295] move "arm64" to a variable so services can incrementally opt in

terraform/modules/function/main.tf

@@ -233,7 +233,7 @@ resource "aws_lambda_function" "this" {
   timeout           = var.timeout
   memory_size       = var.memory_size
   layers            = var.layer_arns
-  architectures     = ["arm64"]
+  architectures     = [var.architecture]
 
   tracing_config {
     mode = "Active"

terraform/modules/function/variables.tf

@@ -32,6 +32,16 @@ variable "handler" {
   default     = "function_handler"
 }
 
+variable "architecture" {
+  description = ""
+  type        = string
+  default     = "x86_64"
+  validation {
+    condition     = contains(["x86_64", "arm64"], var.architecture)
+    error_message = "Valid value for architecture is x86_64 or arm64"
+  }
+}
+
 variable "runtime" {
   description = "Lambda function runtime"
   type        = string