fix: variable validation fix (#753)

Author: piyush117

variables.tf

@@ -135,7 +135,7 @@ variable "key_ring_endpoint_type" {
   description = "The type of endpoint to be used for creating key rings. Accepts 'public' or 'private'"
   default     = "public"
   validation {
-    condition     = can(regex("public|private", var.key_ring_endpoint_type))
+    condition     = can(regex("^(public|private)$", var.key_ring_endpoint_type))
     error_message = "The endpoint_type value must be 'public' or 'private'."
   }
 }
@@ -145,7 +145,7 @@ variable "key_endpoint_type" {
   description = "The type of endpoint to be used for creating keys. Accepts 'public' or 'private'"
   default     = "public"
   validation {
-    condition     = can(regex("public|private", var.key_endpoint_type))
+    condition     = can(regex("^(public|private)$", var.key_endpoint_type))
     error_message = "The endpoint_type value must be 'public' or 'private'."
   }
 }