Implemented the getter for loading the postalcodelocale from env

ref #43

src/models/entities/Address.ts

@@ -6,6 +6,7 @@ import {
   IsString
 } from "class-validator";
 import { Column, Entity, OneToMany, PrimaryGeneratedColumn } from "typeorm";
+import { config } from '../../config';
 import { Participant } from "./Participant";
 import { RunnerOrganisation } from "./RunnerOrganisation";
 
@@ -52,12 +53,11 @@ export class Address {
   /**
    * The address's postal code.
    * This will get checked against the postal code syntax for the configured country.
-   * TODO: Implement the config option. 
    */
   @Column()
   @IsString()
   @IsNotEmpty()
-  @IsPostalCode("DE")
+  @IsPostalCode(config.postalcode_validation_countrycode)
   postalcode: string;
 
   /**