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It is used during project creation if a container is created along with the project, and you can also re-run it by right-clicking on the container in the Containers tool and selecting Rebuild Container.
It only needs to be re-run if the container configuration changes. It is not normally needed if you are just editing source files or other things that are mapped into the container, since those are usually mapped with a file share and immediately update on the running container.
However, it is possible to configure containers to copy and not map directories into the container, and in that case you would have to rebuild and restart the container to get things to update. But Wing doesn't create the containers that way.