Retriable Ruby bundler

retriable-bundle.sh

# Source: http://www.zhuwu.me/blog/posts/solve-gem-installation-timeout-when-building-docker-image
N=0
STATUS=1
until [ ${N} -ge 5 ]
do
  bundle install --without development test --jobs 4 --deployment && STATUS=0 && break
  echo 'Try bundle again ...'
  N=$[${N}+1]
  sleep 1
done
exit ${STATUS}