FROM ruby:2.6.2-slim RUN apt-get update -qq && apt-get install -y locales build-essential git default-libmysqlclient-dev RUN sed -i 's/#.*ja_JP\.UTF/ja_JP\.UTF/' /etc/locale.gen RUN locale-gen && update-locale LANG=ja_JP.UTF-8 RUN mkdir /app WORKDIR /app ADD . /app