Dockerfile

FROM tpill90/steam-lancache-prefill:latest

LABEL org.opencontainers.image.title "Steam Lancache Prefill cronjob"
LABEL org.opencontainers.image.authors TragiicRand2
LABEL org.opencontainers.image.description "Dockerized cronjob running the Steam Lancache prefilling tool, at container initial startup as well as at Midday and Midnight."
LABEL org.opencontainers.image.source https://github.com/TragiicRand2/Lancache-cron-prefill

ENV FILE=/etc/cron.d/prefill-cron

RUN set -x &&\
    apt update &&\
    apt install -qq -y cron

RUN touch ${FILE} &&\
    chmod 0644 ${FILE}

RUN echo "0 0,12 * * * /SteamPrefill prefill > /proc/1/fd/1 2>/proc/1/fd/2" >> ${FILE} &&\
    echo "@reboot /SteamPrefill prefill > /proc/1/fd/1 2>/proc/1/fd/2" >> ${FILE} &&\
    echo "# last line required for value cron file" >> ${FILE}

RUN crontab ${FILE}

ENTRYPOINT [ "cron", "-f", "-l", "1" ]