FROM debian:bullseye ARG APP_DIR="/opt/app" RUN \ apt update && \ apt install -y cron && \ mkdir -p ${APP_DIR} && \ useradd -d ${APP_DIR} -u 1000 user COPY crontab /etc/ COPY testscript.sh ${APP_DIR}/ # USER 1000:1000 WORKDIR ${APP_DIR} CMD [ "/usr/sbin/cron", "-f" ]