Entrypoint for Ruby on Rails app on Docker

docker-entrypoint.sh

#! /bin/bash
bundle exec rake db:migrate

if [[ $? != 0 ]]; then
  echo
  echo "== Failed to migrate. Running setup first."
  echo
  bundle exec rake db:setup
fi

# Execute the given or default command:
exec "$@"

if for some reason bundle exec rake db:migrate - will fail with non zero return code
it will destroy your existing db