How to install SlicerRT extension in docker (slicerDocker) container?

I had a docker container from docker images( and ( And I want to use the extension slicerRT, but I don’t know how to install SlicerRT in slicerDocker container. I have tried (, which doesn’t work. Someone could help me? Thanks in advance. :sob: :sob: :sob:

Please explain what you did exactly and how it didn’t work (error messages, screenshots, anything).