relocate special roles to api request

shared/src/validators/string-list.validator.ts

@@ -0,0 +1,12 @@
+import {
+  IsArray,
+  IsNotEmpty,
+  IsString
+} from 'class-validator';
+import { ComposeValidators } from './compose.validator';
+
+export const IsStringList = ComposeValidators(
+  IsArray(),
+  IsString({ each: true }),
+  IsNotEmpty({ each: true }),
+);