message: purging unused packages
diff: @@ -20,7 +20,8 @@ ENV OC_VERSION=v3.6.0 \
  OC_HASH=c4dd4cf \
  OC_SHA256=ecb0f52560ac766331052a0052b1de646011247f637c15063f4d74432e1ce389
  -RUN apt-get update && apt-get install -y build-essential ssh libmysqlclient-dev curl npm vim \
  +RUN apt-get update \
  + && apt-get install -y curl build-essential libmysqlclient-dev ssh curl npm vim \
  && ln -s /usr/lib/x86_64-linux-gnu/libmysqlclient.so /usr/lib/libmysqlclient.so \
  && curl -Lo /tmp/libnss-mysql.tar.gz "https://downloads.sourceforge.net/project/libnss-mysql/libnss-mysql/1.5/libnss-mysql-1.5.tar.gz" \
  && mkdir /tmp/libnss-mysql \
  @@ -28,7 +29,10 @@ RUN apt-get update && apt-get install -y build-essential ssh libmysqlclient-dev
  && cd /tmp/libnss-mysql \
  && ./configure \
  && make \
  - && make install
  + && make install \
  + && apt-get remove --purge -y build-essential \
  + && apt-get autoremove -y \
  + && rm -rf /var/lib/apt/lists/*
  RUN mkdir -p /openshift-origin-client-tools && \
  curl -Lo /tmp/openshift-origin-client-tools.tar https://github.com/openshift/origin/releases/download/${OC_VERSION}/openshift-origin-client-tools-${OC_VERSION}-${OC_HASH}-linux-64bit.tar.gz && \
  