fix creation of logs dir

Makefile

@@ -8,6 +8,7 @@ prepare-default-gt:
 	docker compose exec app bash scripts/prepare.sh
 
 run:
+	if [ ! -d logs ]; then mkdir logs; fi
 	docker compose exec app bash workflows/execute_workflows.sh > logs/run_$$(date +"%s").log
 
 stop: