inital release of dockerized curl command to update duckdns entry

Dockerfile

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+FROM alpine
+
+RUN apk add -U --no-cache curl
+
+COPY renew-dns.sh /etc/periodic/15min/renew-dns.sh
+
+ENV VERBOSE false
+
+CMD /etc/periodic/15min/renew-dns.sh && crond -f -d 8

renew-dns.sh

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+#!/bin/sh
+
+curl -s "https://www.duckdns.org/update?domains=$DOMAINS&token=$TOKEN&VERBOSE=$VERBOSE"