Update Dockerfile

adding nano for beeing able to edit the settings.txt in the CLI

Dockerfile

@@ -3,11 +3,11 @@ FROM python:alpine
 WORKDIR /usr/src/app
 
 # install dependencies for domain-connect-dyndns
-RUN apk add -U --no-cache gcc build-base linux-headers ca-certificates python3 python3-dev libffi-dev libressl-dev
+RUN apk add -U --no-cache gcc build-base linux-headers ca-certificates python3 python3-dev libffi-dev libressl-dev nano
 
 RUN pip install domain-connect-dyndns
 
 COPY update.sh /etc/periodic/15min/update
 RUN chmod +x /etc/periodic/15min/update
 
-CMD [ "crond", "-l", "2", "-f" ]
+CMD [ "crond", "-l", "2", "-f" ]