refactor: convert config variables to upper case

backend/src/auth/guard/jwt.guard.ts

@@ -11,7 +11,7 @@ export class JwtGuard extends AuthGuard("jwt") {
     try {
       return (await super.canActivate(context)) as boolean;
     } catch {
-      return this.config.get("allowUnauthenticatedShares");
+      return this.config.get("ALLOW_UNAUTHENTICATED_SHARES");
     }
   }
 }