✅ phone countrycode validation in env vars

ref #18 #16

src/models/entities/GroupContact.ts

@@ -8,6 +8,7 @@ import {
   IsString
 } from "class-validator";
 import { Column, Entity, ManyToOne, OneToMany, PrimaryGeneratedColumn } from "typeorm";
+import { config } from '../../config';
 import { Address } from "./Address";
 import { RunnerGroup } from "./RunnerGroup";
 
@@ -62,7 +63,7 @@ export class GroupContact {
    */
   @Column({ nullable: true })
   @IsOptional()
-  @IsPhoneNumber("DE")
+  @IsPhoneNumber(config.phone_validation_countrycode)
   phone?: string;
 
   /**