docker: add comment reminder to remove nodejs and 'jupyter lab build'…

… step

See comment jupyterlab/jupyterlab#11726 (comment)
and issue plotly/jupyter-dash#49

docker/Dockerfile

@@ -58,6 +58,10 @@ RUN python -m ipykernel install --name birdy
 # build jupyterlab extensions installed by conda, see `jupyter labextension list`
 # Supposedly not needed with jupyterlab v3 anymore but see
 # https://github.com/jupyterlab/jupyterlab/issues/11726#issuecomment-998901247
+# TODO: remove 'jupyter lab build' step once all extensions move to prebuilt extensions,
+# see comment https://github.com/jupyterlab/jupyterlab/issues/11726#issuecomment-998917305
+# Currently jupyter-dash is holding back this step, see
+# https://github.com/plotly/jupyter-dash/issues/49
 RUN jupyter lab build
 
 RUN jupyter serverextension enable voila --sys-prefix

docker/environment.yml

@@ -143,6 +143,8 @@ dependencies:
   - jupyter-dash
   # Force newer nodejs for 'jupyter lab build' issue
   # https://github.com/jupyterlab/jupyterlab/issues/11726#issuecomment-998901247
+  # TODO: remove nodejs once all extensions move to prebuilt extensions, see comment
+  # https://github.com/jupyterlab/jupyterlab/issues/11726#issuecomment-998917305
   - nodejs >= 17.1.0
   # utilities
   - curl