Add type definition

Author: NamelessOne91

terracumber_config/tf_files/variables/build-validation-variables.tf

@@ -115,6 +115,7 @@ variable "SERVER_CONTAINER_REPOSITORY" {
 }
 
 variable "SERVER_ADDITIONAL_REPOS" {
+  type        = map(string)
   description = "extra server repositories in the form {label = url}"
   default     = {}
 }
@@ -126,6 +127,7 @@ variable "PROXY_CONTAINER_REPOSITORY" {
 }
 
 variable "PROXY_ADDITIONAL_REPOS" {
+  type        = map(string)
   description = "extra proxy repositories in the form {label = url}"
   default     = {}
 }