FROM alpine:latest

RUN apk add --no-cache --upgrade \
        curl certbot openssl

RUN mkdir -p /etc/periodic/12h \
    && mkdir -p /etc/periodic/5min

COPY certbot-* duckdns start-certbot-duckdns.sh /usr/local/bin/
COPY etc/periodic/ /etc/periodic/

VOLUME /etc/letsencrypt/

ENTRYPOINT [ "/bin/sh", "-c" ]
CMD [ "duckdns; certbot-duckdns; start-certbot-duckdns.sh" ]