Unfortunately you cannot merge multiple graphs after they are built, and I am not aware of any tool that would allow that.
The graphs need to go to the folder mapped in docker to where the graphs are generated. The docker-compose file in the repository maps that to
./graphs on the host, which is
/opt/ors/graphs in the container. After copying, you need to restart the container for the graphs to be loaded.
So you would need to modify the docker-compose of the builder to have something like
- ./built-graphs:/ors-core/data/graphs. If you are building the car profile, that would create the graph data in the folder
./built-graphs/driving-car/. You then need to copy the complete
driving-car folder to the production graphs folder, so it would be something like
./graphs/driving-car/... and then restart the production container.