Enable ZMQ in docker IRI node

Question

I've set up a private tangle following the guide on iotaledger/compass. Now I'm trying to enable zmq. I tried to change the following in the 03_run_coordinator.sh file. Changes are adding the 5556 port and the zmq_enabled configuration.

docker pull iotaledger/iri:latest
docker run -p 5556:5556 -t --net host --rm -v $scriptdir/db:/iri/data -v $scriptdir/snapshot.txt:/snapshot.txt -p 14265 iotaledger/iri:latest \
       --testnet \
       ..
       --zmq_enabled true

Unfortunately, it seems like zmq is still disabled.