Adjust dockerfile for new package structure

Dockerfile

@@ -2,6 +2,7 @@ FROM python:3
 
 RUN mkdir -p /app/output
 WORKDIR /app
-COPY ./coles.py ./woolies.py ./requirements.txt ./
+COPY ./main.py ./requirements.txt ./
 RUN pip3 install -r requirements.txt
+COPY hotprices_au ./hotprices_au
 ENTRYPOINT [ "python3" ]