rbenv with Docker and Ubuntu 18.04

Dockerfile

FROM ubuntu:18.04

RUN apt-get update && apt-get install -y \
  autoconf \
  bison \
  build-essential \
  curl \
  gcc-6 \
  git \
  libffi-dev \
  libgdbm-dev \
  libgdbm5 \
  libncurses5-dev \
  libreadline6-dev \
  libssl-dev \
  libyaml-dev \
  zlib1g-dev

ENV RBENV_ROOT /usr/local/src/rbenv
ENV RUBY_VERSION 2.5.1

ENV PATH ${RBENV_ROOT}/bin:${RBENV_ROOT}/shims:$PATH

RUN git clone https://github.com/rbenv/rbenv.git ${RBENV_ROOT} \
  && git clone https://github.com/rbenv/ruby-build.git \
    ${RBENV_ROOT}/plugins/ruby-build \
  && ${RBENV_ROOT}/plugins/ruby-build/install.sh \
  && echo 'eval "$(rbenv init -)"' >> /etc/profile.d/rbenv.sh

RUN rbenv install ${RUBY_VERSION} \
  && rbenv global ${RUBY_VERSION}

RUN gem install bundler

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