Install nodejs=16 in docker, and pin nbclassic under 0.4.0

Author: foo

demos/Dockerfile

@@ -6,12 +6,24 @@
 
 FROM ubuntu:22.04
 ENV DEBIAN_FRONTEND=noninteractive
+ENV NODE_VERSION=16.17.1
+
 RUN apt-get update \
  && apt-get -y dist-upgrade \
- && apt-get -y install git sudo
+ && apt-get -y install git sudo curl
+
 # cache some of the bigger installs
-RUN apt-get -y install python3-pip nodejs npm
-RUN python3 -m pip install --upgrade jupyterhub notebook nbclassic
+RUN apt-get -y install python3-pip npm
+RUN python3 -m pip install --upgrade jupyterhub
+
+# Install nodejs v16 (not available yet on apt).
+ENV NVM_DIR=/root/.nvm
+RUN curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
+RUN . "$NVM_DIR/nvm.sh" && nvm install ${NODE_VERSION}
+RUN . "$NVM_DIR/nvm.sh" && nvm use v${NODE_VERSION}
+RUN . "$NVM_DIR/nvm.sh" && nvm alias default v${NODE_VERSION}
+ENV PATH="/root/.nvm/versions/node/v${NODE_VERSION}/bin/:${PATH}"
+
 RUN git clone https://github.com/jupyter/nbgrader /srv/nbgrader/nbgrader
 # COPY is like deploy_demos.sh
 COPY ./ /root/

demos/restart_demo.sh

@@ -26,6 +26,7 @@ install_dependencies () {
     apt install -y npm
     npm install -g configurable-http-proxy
     apt install -y python3-pip
+    pip3 install -U nbclassic==0.3.7
     pip3 install -U jupyterlab
     pip3 install -U jupyterhub
 }