provide a way to run app

internal/store/mongo/store.go

@@ -37,6 +37,13 @@ type repository struct {
 	client *mongo.Client
 }
 
+func (r *repository) Close() error {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	defer cancel()
+
+	return r.client.Disconnect(ctx)
+}
+
 func (r *repository) StatsRepository() statsRepository {
 	return statsRepository{
 		collection: r.client.Database("bench").Collection("device_stats"),