Specified uft-8 format for string

ref #112

src/controllers/RunnerSelfServiceController.ts

@@ -83,7 +83,7 @@ export class RunnerSelfServiceController {
 	 * @param token The organisation's registration api token.
 	 */
 	private async getOrgansisation(token: string): Promise<RunnerGroup> {
-		token = Buffer.from(token, 'base64').toString();
+		token = Buffer.from(token, 'base64').toString('utf8');
 
 		const organisation = await this.orgRepository.findOne({ key: token });
 		if (!organisation) { throw new RunnerOrganisationNotFoundError; }