Dockerfile
FROM ruby:2.6.3
# set locales
RUN apt-get update >/dev/null && \
apt-get install -y locales >/dev/null && \
echo "en_US UTF-8" > /etc/locale.gen && \
locale-gen en_US.UTF-8 && \
gem install bundler -v 1.17.1 && \
export LANG=en_US.UTF-8 && \
export LANGUAGE=en_US.UTF-8 && \
export LC_ALL=en_US.UTF-8
RUN curl -sL https://deb.nodesource.com/setup_10.x | bash - && \
apt-get install -y nodejs
COPY Gemfile Gemfile.lock /app/
RUN cd /app && gem install bundler && bundle install