(b)ash script to automatically run extra scripts before the actual docker entrypoint

freestart.sh

#!/bin/sh

# depends on env first, if none,
# fall back to /etc/docker-entrypoint/init.d
ENTRYPOINTS_D=${ENTRYPOINTS_D:-/etc/docker-entrypoint/init.d}

# ensure entrypoints dir exists
mkdir -p /etc/docker-entrypoint/init.d

# load all .sh files according to glob sequence
for initscript in $(find $ENTRYPOINTS_D -maxdepth 1 -type f -name "*.sh" | sort); do
  sh $initscript > /dev/stdout 2>/dev/stderr
done

# once done, exec the actual intended script
exec $@