The command i give you the hint to is an extract from the “github help for AIO users of NC”.
It shouldn’t be nescessary to look for the config file itself. By using the command itself, the option will be set.
Looking for the “inner” of the docker you’ll have to login
e.g. by
docker exec -ti “NAME-OF-THE-IMAGE” bash
If that fails first time you could stop and start the docker image by
docker stop “NAME-OF-THE-IMAGE”
docker start “NAME-OF-THE-IMAGE”
and repeat the docker command to login.
But this all is obsolete if you modify your config by using the first occ command