Containerization of Node-Red failing: cannot find module 'express' - docker

Question

I am very new to Docker.
I am getting an error saying "cannot find module 'express'" while trying to containerize simple node-red application. The details are as follows:
Base machine
OS -Debian 9 (stretch) 64-bit
RAM -8 gb
GNOME - 3.22.2
Env - Oracle Virtual Box
Node-Red source
https://github.com/node-red/node-red.git
Docker Version
17.12.0-ce, build c97c6d6
docker-compose -v
1.20.1, build 5d8c71b
Docker File
FROM debian:stretch-slim
RUN useradd -c 'Node-Red user' -m -d /home/nodered -s /bin/bash nodered
RUN chown -R nodered.nodered /home/nodered
RUN echo "Acquire::http::Proxy \"http://xxxx:yyyy";" > /etc/apt/apt.conf.d/01turnkey \
&& echo "Acquire::https::Proxy \"http://xxxx.yyyy";" >> /etc/apt/apt.conf.d/01turnkey
ENV http_proxy="http://xxxx:yyyy \
https_proxy="http://xxxx:yyyy"
USER root
RUN apt-get update && apt-get -y install --no-install-recommends \
ca-certificates \
apt-utils \
curl \
sudo \
git \
python \
make \
g++ \
gnupg2
RUN mkdir -p /home/nodered/shaan-node-red && chown -R nodered.nodered /home/nodered/shaan-node-red
ENV HOME /home/nodered/shaan-node-red
WORKDIR /home/nodered/shaan-node-red
RUN ls -la
RUN env
USER root
RUN echo "nodered ALL=(root) NOPASSWD:ALL" > /etc/sudoers.d/nodered && \
chmod 0440 /etc/sudoers.d/nodered
RUN curl -sL https://deb.nodesource.com/setup_9.x | bash -
RUN apt-get -y install nodejs
RUN rm -rf node-v9.x
RUN node -v (v9.9.0) && npm -v (5.6.0)
RUN npm config set proxy "http://xxxx:yyyy" \
npm config set http-proxy "http://xxxx:yyyy"
COPY . /home/nodered/shaan-node-red
RUN cd /home/nodered/shaan-node-red && ls -la && npm install
RUN npm run build && ls -la
RUN cd /home/nodered/shaan-node-red/node_modules/ && git clone https://github.com/netsmarttech/node-red-contrib-s7.git && ls -la | grep s7 && cd ./node-red-contrib-s7 && npm install
RUN ls -la /home/nodered/shaan-node-red/node_modules
ENTRYPOINT ["sh","entrypoint.sh"]
entrypoint.sh
node /home/nodered/shaan-node-red/red.js
Docker-compose.yml
version: '2.0'
services:
web:
image: shaan-node-red
build: .
volumes:
- .:/home/nodered/shaan-node-red
ports:
- "1880:1880"
- "5858:5858"
network_mode: host
Building with command:
docker-compose up
Error description
Note
Not getting any error while building same node-red at the base machine.