docker-baseimage-ubuntu/root/etc/cont-init.d/99-custom-scripts

#!/usr/bin/with-contenv bash

# Make sure custom script directory exists and has files in it
SCRIPTS_DIR="/config/custom-init-scripts"
if [ -e "${SCRIPTS_DIR}" ] && \
   [ -n "$(/bin/ls -A ${SCRIPTS_DIR} 2>/dev/null)" ]; then
    echo "[custom-init] files found in ${SCRIPTS_DIR} executing"
    for SCRIPT in ${SCRIPTS_DIR}/*; do
        echo "[custom-init] ${SCRIPT}: executing..."
        /bin/bash ${SCRIPT}
        echo "[custom-init] ${SCRIPT}: exited $?"
    done
else
    echo "[custom-init] no custom scripts found exiting..."
fi

# Make sure custom services directory exists and has files in it
SERVICES_DIR="/config/custom-services.d"
if [ -e "${SERVICES_DIR}" ] && \
   [ -n "$(/bin/ls -A ${SERVICES_DIR} 2>/dev/null)" ]; then
    echo "[custom-init] service folders found in ${SERVICES_DIR} executing"
    for SERVICE in ${SERVICES_DIR}/*; do
        echo "[custom-init] ${SERVICE}: copying..."
        cp -r ${SERVICE} /etc/services.d/
        chmod +x /etc/services.d/${SERVICE}/run
        echo "[custom-init] ${SERVICE}: done"
    done
else
    echo "[custom-init] no custom services found exiting..."
fi