ARG ALPINE_VERSION=latest
FROM alpine:${ALPINE_VERSION}

ARG APK_MIRROR=dl-cdn.alpinelinux.org

RUN sed -i "s/dl-cdn.alpinelinux.org/${APK_MIRROR}/g" /etc/apk/repositories && \
    apk --no-cache --no-progress add jq curl && \
    rm -rf /tmp/*

COPY motd.run /etc/periodic/hourly/

VOLUME ["/mnt/motd"]

ENTRYPOINT ["crond", "-f", "-d", "8"]