Dockerfile for Ruby 2.3 on Gitpod

Dockerfile

FROM ubuntu:16.04

RUN apt-get update

### base ###
RUN apt-get update && \
    apt-get install -yq build-essential sudo vim wget links curl rsync bc git git-core apt-transport-https libxml2 \
        libxml2-dev libcurl4-openssl-dev openssl sqlite3 libsqlite3-dev gawk libreadline6-dev libyaml-dev autoconf \
        libgdbm-dev libncurses5-dev automake zlib1g-dev libgmp-dev libssl-dev libmysqlclient-dev libpq-dev gnupg2 && \
    rm -rf /var/lib/apt/lists/*

RUN useradd -l -u 33333 -G sudo -md /home/gitpod -s /bin/bash -p gitpod gitpod \
    # passwordless sudo for users in the 'sudo' group
    && sed -i.bkp -e 's/%sudo\s\+ALL=(ALL\(:ALL\)\?)\s\+ALL/%sudo ALL=NOPASSWD:ALL/g' /etc/sudoers
ENV HOME=/home/gitpod
WORKDIR $HOME
RUN { echo && echo "PS1='\[\e]0;\u \w\a\]\[\033[01;32m\]\u\[\033[00m\] \[\033[01;34m\]\w\[\033[00m\] \\\$ '" ; } >> .bashrc

RUN sudo echo "Running 'sudo' for Gitpod: success" && \
    # create .bashrc.d folder and source it in the bashrc
    mkdir /home/gitpod/.bashrc.d && \
    (echo; echo "for i in \$(ls \$HOME/.bashrc.d/*); do source \$i; done"; echo) >> /home/gitpod/.bashrc

RUN curl -sSL https://rvm.io/mpapis.asc | gpg --import - \
    && curl -sSL https://rvm.io/pkuczynski.asc | gpg --import - \
    && curl -fsSL https://get.rvm.io | bash -s stable \
    && bash -lc " \
        rvm requirements \
        && rvm install 2.3.6 \
        && rvm use 2.3.6 --default \
        && rvm rubygems current \
        && gem install bundler --no-document \
        && gem install solargraph --no-document" \
    && echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # Load RVM into a shell session
ENV GEM_HOME=/workspace/.rvm