ARG ALPINE_VERSION=latest
FROM alpine:${ALPINE_VERSION}

ARG APK_MIRROR=dl-cdn.alpinelinux.org

COPY motd.run /etc/periodic/hourly/

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

VOLUME ["/mnt/motd"]

ENV TZ=Asia/Shanghai

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