anchor.diff:  FROM ruby:3.0.0
   
   ENV DEBIAN_FRONTEND noninteractive
  -
  -# Set timezone
  -RUN echo Asia/Tokyo > /etc/timezone
  -RUN dpkg-reconfigure -f noninteractive tzdata
   
   # Install required packages
   RUN apt-get update -qq \
  
positive.code: #   docker run -t -i --name "jay" -p 12321:12321 jay
  #
  # In jay container:
  #   1 In config/application_settings.yml,
  #     setup　GitHub's organization, client_id, client_secret, and allowed_team_id
  #   2 $ EDITOR="vim" bundle exec rails credentials:edit
  #   3 $ bundle exec rake db:migrate
  #   4 $ bundle exec rake db:migrate RAILS_ENV=production
  #
  # Invoke jay server:
  #   scripts/launch.sh production
  
negative.code: ENV LANG ja_JP.UTF-8
  ENV LANGUAGE ja_JP:ja
  ENV LC_TIME C
  ENV TZ Asia/Tokyo
  RUN localedef -f UTF-8 -i ja_JP ja_JP.utf8
  
  # Add jay user
  