add name_tag_name, add type for tags var

s3_cloudtrail.tf

@@ -12,7 +12,7 @@ resource "aws_s3_bucket" "cloudtrail_bucket" {
     }
   }
 
-  tags = "${merge(var.tags, map("Name", format("%s", local.bucket_name)))}"
+  tags = "${merge(var.tags, map(var.name_tag_name, format("%s", local.bucket_name)))}"
 }
 
 resource "aws_s3_bucket_policy" "cloudtrail_bucket_policy" {

variables.tf

@@ -58,4 +58,10 @@ variable "trail_bucket_default_encryption_key" {
 variable "tags" {
   description = "A map of tags to add to all resources"
   default     = {}
+  type        = "map"
+}
+
+variable "name_tag_name" {
+  description = "Name of the 'name' tag that is added to, for example, the S3 resources"
+  default     = "Name"
 }