Update Dockerfile

Author: jimboid

docker/Dockerfile

@@ -19,7 +19,7 @@ RUN conda install termcolor matplotlib seaborn pandas openbabel vina
 
 # Get workshop files and move them to jovyan directory.
 COPY --chown=1000:100 . .
-RUN rm -r chimerax_commands.cxc LICENSE README.md docking_with_rescoring docker .git .github
+RUN rm -rf chimerax_commands.cxc LICENSE README.md docking_with_rescoring docker .git .github
 
 # Copy lab workspace
 COPY --chown=1000:100 docker/default-37a8.jupyterlab-workspace /home/jovyan/.jupyter/lab/workspaces/default-37a8.jupyterlab-workspace