iHaskell Jupyter Lab Docker Image Build

Dockerfile

```Dockerfile
FROM fpco/stack-build:lts-14.7

# Install all necessary Ubuntu packages
RUN apt-get update && apt-get install -y python3-pip libgmp-dev libmagic-dev libtinfo-dev libzmq3-dev libcairo2-dev libpango1.0-dev libblas-dev liblapack-dev gcc g++ nodejs && \
    rm -rf /var/lib/apt/lists/*

# Install Jupyter notebook
RUN pip3 install -U jupyterlab

ARG NB_USER=defaultuser
ARG NB_UID=1000

ENV LANG en_US.UTF-8
ENV HOME /home/${NB_USER}

RUN adduser --disabled-password \
    --gecos "Default user" \
    --uid ${NB_UID} \
    ${NB_USER}

# Set up a working directory for IHaskell
RUN mkdir ${HOME}/ihaskell
WORKDIR ${HOME}/ihaskell

USER root
RUN chown -R ${NB_UID} ${HOME}
USER ${NB_UID}

# Set up stack
COPY stack.yaml stack.yaml
RUN stack config set system-ghc --global true

# Install dependencies for IHaskell
COPY ihaskell.cabal ihaskell.cabal
COPY ipython-kernel ipython-kernel
COPY ghc-parser ghc-parser
COPY ihaskell-display ihaskell-display

USER root
RUN chown -R ${NB_UID} ${HOME}
USER ${NB_UID}

RUN stack build --only-snapshot

# Install IHaskell itself. Don't just COPY . so that
# changes in e.g. README.md don't trigger rebuild.
COPY src ${HOME}/ihaskell/src
COPY html ${HOME}/ihaskell/html
COPY main ${HOME}/ihaskell/main
COPY LICENSE ${HOME}/ihaskell/LICENSE

USER root
RUN chown -R ${NB_UID} ${HOME}
USER ${NB_UID}

RUN stack build && stack install

# Run the notebook
ENV PATH $(stack path --local-install-root)/bin:$(stack path --snapshot-install-root)/bin:$(stack path --compiler-bin):/home/${NB_USER}/.local/bin:${PATH}
RUN ihaskell install --stack

USER root
COPY jupyter_lab_extensions.sh ./jupyter_lab_extensions.sh
RUN bash ./jupyter_lab_extensions.sh
RUN jupyter notebook --generate-config

RUN chown -R ${NB_UID} ${HOME}
USER ${NB_UID}

WORKDIR ${HOME}
CMD ["jupyter", "lab", "--allow-root", "--ip", "0.0.0.0"]
```

jupyter_lab_extensions.sh

#!/bin/bash
# File create by Heath Robertson CodeHappens@ToiletHill
echo "Startup Commands Executing -Heath"

declare -a lst=("jupyterlab_vim" "@jupyterlab/toc" "@ijmbarr/jupyterlab_spellchecker")

for i in ${lst[*]}
do 
    jupyter labextension install ${i}
    jupyter labextension enable ${i}
    echo ${i}
done