Looking for help running spectron inside a Docker container

[MarshallOfSound]

So I'm trying to get Spectron running headlessly inside a docker container using xvfb and it doesn't start Electron no matter what I try to do.

This is my docker file

FROM node:6.3

RUN apt-get update
RUN apt-get install g++-multilib lib32z1 lib32ncurses5 -y
RUN apt-get install rpm fakeroot dpkg libdbus-1-dev libx11-dev -y
RUN apt-get install libavahi-compat-libdnssd-dev g++ -y
RUN apt-get install gcc-4.8-multilib g++-4.8-multilib -y
RUN apt-get install libgtk2.0-0 libgtk2.0-dev xvfb -y
RUN apt-get install libxtst6 -y

WORKDIR /app

COPY package.json /app
RUN npm install

RUN apt-get install libxss1 libnss3 libasound2 libgconf-2-4 -y

RUN export ELECTRON_ENABLE_STACK_DUMPING=true
RUN export ELECTRON_ENABLE_LOGGING=true

ADD vendor/docker-entrypoint.sh /entrypoint.sh
RUN chmod 777 /entrypoint.sh
ENTRYPOINT ["/bin/sh", "/entrypoint.sh"]

COPY . /app

And this is my entrypoint.sh

#!/bin/bash

echo "Starting Xvfb"
Xvfb :99 -ac &
sleep 2

export DISPLAY=:99
echo "Executing command $@"

exec "$@"

This exact config works for electron-mocha which also launches electron processes so I can't tell why Electron isn't starting in this container. If I launch the container interactively I can launch the electron process and get logs indicating it is running successfully. Is there some dependency I am missing for the chromedriver or something?

[MarshallOfSound]

Urgh, this was my bad. The container wasn't running npm run build so electron couldn't find the JS files to run 😢

It runs inside docker nicely now 😄

[koalalorenzo]

I am trying to make it work but I always have the error:

ChromeDriver did not start within 5000ms

Can we have an example of how you made that working?

[noblenet]

I dont get it - there is a lot of guides telling this is straightforward and easy, but I haven't been able to get passed the "Error: ChromeDriver did not start within 5000ms". I'm on windows 10 with v12.18.3 and chromedriver 84.0.4147.30 (No problem just starting that one). I have tried to use a docker but that didn't help - same, same.
Any ideas