Dockerfile

FROM ruby:2.6.3
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
RUN apt-get install -y yarn
# Replace shell with bash so we can source files
RUN rm /bin/sh && ln -s /bin/bash /bin/sh

RUN apt remove cmdtest -y
RUN apt remove yarn -y
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
RUN apt-get update
RUN apt-get install yarn -y

# Set debconf to run non-interactively
RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections

SHELL ["/bin/bash", "--login", "-c"]
RUN curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
RUN nvm install 12.0.0

RUN mkdir /myapp
WORKDIR /myapp
RUN gem install bundler:2.2.3
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install