Dockerfile

FROM golang:1.7

# golang + ruby:2.3

# from https://github.com/docker-library/buildpack-deps/blob/master/jessie/Dockerfile

RUN apt-get update && apt-get install -y --no-install-recommends \
		autoconf \
		automake \
		bzip2 \
		file \
		g++ \
		gcc \
		imagemagick \
		libbz2-dev \
		libc6-dev \
		libcurl4-openssl-dev \
		libevent-dev \
		libffi-dev \
		libgeoip-dev \
		libglib2.0-dev \
		libjpeg-dev \
		liblzma-dev \
		libmagickcore-dev \
		libmagickwand-dev \
		libmysqlclient-dev \
		libncurses-dev \
		libpng-dev \
		libpq-dev \
		libreadline-dev \
		libsqlite3-dev \
		libssl-dev \
		libtool \
		libwebp-dev \
		libxml2-dev \
		libxslt-dev \
		libyaml-dev \
		make \
		patch \
		xz-utils \
		zlib1g-dev \
	&& rm -rf /var/lib/apt/lists/*

# from https://github.com/docker-library/ruby/blob/1b08f346713a1293c2a9238e470e086126e2e28f/2.3/Dockerfile
                                
ENV RUBY_MAJOR 2.3
ENV RUBY_VERSION 2.3.0
ENV RUBY_DOWNLOAD_SHA256 ba5ba60e5f1aa21b4ef8e9bf35b9ddb57286cb546aac4b5a28c71f459467e507
ENV RUBYGEMS_VERSION 2.5.1

# skip installing gem documentation
RUN echo 'install: --no-document\nupdate: --no-document' >> "$HOME/.gemrc"

# some of ruby's build scripts are written in ruby
# we purge this later to make sure our final image uses what we just built
RUN apt-get update \
	&& apt-get install -y autoconf bison libgdbm-dev ruby \
	&& rm -rf /var/lib/apt/lists/* \
	&& mkdir -p /usr/src/ruby \
	&& curl -fSL -o ruby.tar.gz "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.gz" \
	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
	&& tar -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
	&& rm ruby.tar.gz \
	&& cd /usr/src/ruby \
	&& autoconf \
	&& ./configure --disable-install-doc \
	&& make -j"$(nproc)" \
	&& make install \
	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
	&& gem update --system $RUBYGEMS_VERSION \
	&& rm -r /usr/src/ruby

# install things globally, for great justice
ENV GEM_HOME /usr/local/bundle
ENV PATH $GEM_HOME/bin:$PATH

ENV BUNDLER_VERSION 1.11.2

RUN gem install bundler --version "$BUNDLER_VERSION" \
	&& bundle config --global path "$GEM_HOME" \
	&& bundle config --global bin "$GEM_HOME/bin"

# don't create ".bundle" in all our apps
ENV BUNDLE_APP_CONFIG $GEM_HOME