Implemented the getter for loading the postalcodelocale from env

ref #43

src/models/actions/CreateAddress.ts

@@ -1,4 +1,5 @@
 import { IsNotEmpty, IsOptional, IsPostalCode, IsString } from 'class-validator';
+import { config } from '../../config';
 import { Address } from '../entities/Address';
 
 /**
@@ -35,7 +36,7 @@ export class CreateAddress {
      */
     @IsString()
     @IsNotEmpty()
-    @IsPostalCode("DE")
+    @IsPostalCode(config.postalcode_validation_countrycode)
     postalcode: string;
 
     /**