upd Dockerfile

Dockerfile

@@ -12,15 +12,14 @@ RUN mkdir /app
 WORKDIR /app
 
 COPY pddnsc ./pddnsc
-RUN mkdir settings
-RUN mkdir state
+RUN mkdir settings state
 COPY requirements.txt .
 
-RUN pip install -r requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
+VOLUME /app/settings
 VOLUME /app/state
 
-CMD sh -c 'echo "\
+CMD sh -exc 'echo "\
 $SCHEDULE cd /app && python -m pddnsc.cli \
 " > /etc/crontabs/root && exec crond -l 1 -f'
-