Add suffix checking helper

modules/validation/helpers.go

@@ -151,3 +151,7 @@ func ValidateOneOf(value string, allowed []string) []string {
 	}
 	return []string{fmt.Sprintf("Value %v is not contained in allowed values [%v]", value, allowed)}
 }
+
+func ValidateSuffix(str, suffix string) bool {
+	return strings.HasSuffix(str, suffix)
+}