message: Update Dockerfile.builder to include deps for ruby and jvm
diff: -FROM debian:stretch-slim
  +FROM i386/debian:stretch-slim
  LABEL maintainer "niv@nwnx.io"
  -RUN dpkg --add-architecture i386 && apt-get update
  +RUN apt-get update
  # core stuff
  RUN apt-get install -y --no-install-recommends \
  build-essential cmake gperf git \
  - gcc-6-multilib g++-6-multilib
  + gcc-6 g++-6
  # NWNX_SQL
  -RUN apt-get install -y default-libmysqlclient-dev:i386
  +RUN apt-get install -y default-libmysqlclient-dev
  # NWNX_SECCOMP
  -RUN apt-get install -y libseccomp-dev:i386
  +RUN apt-get install -y libseccomp-dev
  +
  +# NWNX_RUBY
  +RUN apt-get install -y ruby-dev
  +
  +# NWNX_JVM
  +RUN mkdir -p /usr/share/man/man1
  +RUN apt-get install -y openjdk-8-jdk-headless
  # slim down the image again.
  RUN rm -r /var/lib/apt/lists /var/cache/apt
  -
  -CMD ["/bin/bash"]
  