Dockerfile
FROM ruby:2.6
# Set the locale
RUN apt-get clean && apt-get update && apt-get install -y locales
RUN locale-gen en_US.UTF-8 && \
localedef -i en_US -f UTF-8 en_US.UTF-8 && \
update-locale LANG=en_US.UTF-8
ENV LANG=en_US.UTF-8 \
LANGUAGE=en_US:en \
LC_ALL=en_US.UTF-8
RUN mkdir /usr/app
WORKDIR /usr/app
ADD Gemfile /usr/app/Gemfile
ADD Gemfile.lock /usr/app/Gemfile.lock
RUN bundle install
ADD . /usr/app
CMD ruby /usr/app/run.rb