railties/lib/rails/generators/rails/app/templates/docker-entrypoint.tt

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#!/bin/bash -e

# Enable jemalloc for reduced memory usage and latency.
if [ -z "${LD_PRELOAD+x}" ] && [ -f /usr/lib/*/libjemalloc.so.2 ]; then
  export LD_PRELOAD="$(echo /usr/lib/*/libjemalloc.so.2)"
fi

<% unless skip_active_record? -%>
# If running the rails server then create or migrate existing database
if [ "${1}" == "./bin/rails" ] && [ "${2}" == "server" ]; then
  ./bin/rails db:prepare
fi

<% end -%>
exec "${@}"