feat: created_via for tracking how runners got into the system (#212)

close #211

squash merge please:)

Reviewed-on: #212

src/models/actions/create/CreateSelfServiceCitizenRunner.ts

@@ -26,6 +26,7 @@ export class CreateSelfServiceCitizenRunner extends CreateParticipant {
     public async toEntity(): Promise<Runner> {
         let newRunner: Runner = new Runner();
 
+        newRunner.created_via = "selfservice";
         newRunner.firstname = this.firstname;
         newRunner.middlename = this.middlename;
         newRunner.lastname = this.lastname;