Install it using
./install.sh
Open a shell to it with:
. krogoth.env
krogoth
If the mounted /oe has no opendreambox krogoth, you can start with something like this
cd /oe
git clone https://github.com/opendreambox/opendreambox.git -b krogoth krogoth
cd krogoth
make image MACHINE=<dm920|dm900|dm520|dm7080|dm820>
To clean up containers created before there was the "install and use" procedure you can use
docker container prune
which will delete ALL unused containers (even those that are not related to the docker-opendreambox containers!)