Dockerfile in xcflushd-1.1.0 vs Dockerfile in xcflushd-1.2.0

@@ -31,11 +31,11 @@
  && dpkg-reconfigure --frontend ${DEBIAN_FRONTEND} tzdata \
  && apt-get -y -q autoremove --purge \
  && chown -R ${USER_NAME}: ${USER_HOME} \
  && apt-get -y -q clean
 
-RUN apt-get install -y -q openjdk-8-jre
+RUN apt-get install -y -q openjdk-8-jre && apt-get -y -q clean
 
 USER ${USER_NAME}
 
 ARG RBENV_ROOT="${USER_HOME}/.rbenv"
 ARG RBENV_BINPATH="${RBENV_ROOT}/bin"
@@ -65,11 +65,11 @@
 ARG BUILD_DEPS="libyaml-dev libreadline-dev libncurses-dev libffi-dev libgdbm3 libgdbm-dev"
 
 USER root
 RUN test -z "${BUILD_DEPS}" \
  || ( \
-      apt-get update && apt-get install -y -q ${BUILD_DEPS} \
+      apt-get update && apt-get install -y -q ${BUILD_DEPS} && apt-get -y -q clean \
     )
 
 WORKDIR ${APP_HOME}
 COPY .ruby-version .ruby-gemset ${APP_HOME}/
 
@@ -79,10 +79,11 @@
  && rbenv rehash \
  && echo 'gem: --no-document' >> ~/.gemrc \
  && gem update --system  \
  && ( bundler --version || gem install bundler ) \
  && bundle config --global jobs `grep -c processor /proc/cpuinfo` \
- && bundle config --global cache_all true
+ && bundle config --global cache_all true \
+ && gem cleanup all
 
 COPY Gemfile Gemfile.lock xcflushd.gemspec ${APP_HOME}/
 COPY lib/xcflushd/version.rb ${APP_HOME}/lib/xcflushd/
 USER root
 RUN chown -R ${USER_NAME}: ${APP_HOME}