wrapper_script.sh

#!/bin/bash

cp    -TRn /init-config/ /config
chown -R   abc:abc       /config

# MyDocker send a username to $1 and a password to $2
if [ "$2" ]; then
    export CUSTOM_USER=$1
    export PASSWORD=$2
    
    # Do this only on MyDocker where there are 2 IP adresses
    echo "$(hostname -I | cut -f2 -d' ') $HOSTNAME" >> /etc/hosts
fi

exec /init