git clone the couchpotato in NAS location attached to your docker machine
pull this image from docker
run the container docker run -d --name couchpotato ykanello/couchpotato -P8081:8081 --mount type=bind,source=/export/storage/Movies,target=/Movies --mount type=bind,source=/export/storage/ISO/couchpotato /couchpotato
execute the python app: docker exec -d couchpotato /couchpotato/CouchPotatoServer/CouchPotato.py