Dockerfile: Ruby 2.3.3 + nodejs + yarn + locales en_US.UTF-8

Dockerfile

FROM ruby:2.3.3

# change this to force update node minor and patch version
ENV NODE_DATE_INSTALL 20170519

# change this to update node major version
RUN curl -sL https://deb.nodesource.com/setup_7.x | bash -

RUN apt-get update &&\
    # add support to unicode chars from keyboard: ç,ã,ô:
    apt-get install -y locales \
                       nodejs &&\
    echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && /usr/sbin/locale-gen &&\
    rm -rf /var/lib/apt/lists/*

ENV LANG en_US.UTF-8
ENV LANGUAGE en_US.UTF-8
ENV LC_ALL en_US.UTF-8

ENV APP_ROOT /app

RUN mkdir $APP_ROOT

WORKDIR $APP_ROOT

RUN groupadd -r app &&\
    groupmod -g 1000 app &&\
    useradd -g app -ms /bin/bash app &&\
    chown -R app:app $APP_ROOT

USER app

RUN curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 0.24.5

ENV PATH $PATH:$HOME/.yarn/bin:$PATH