How to set up a Docker container for Firebird 1.5?

Question

firebird

Actually found the repository
https://hub.docker.com/r/vyper/firebird/
I create a container using

sudo docker run -p 3050:3050 -v /var/firebirddb:/var/firebirddb --restart=always -it vyper/firebird \

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                    NAMES
2af15215ebf2        vyper/firebird      "isql"              20 seconds ago      Up 19 seconds       0.0.0.0:3050->3050/tcp   competent_lamport

I'm trying to connect with FlameRobin. Does not work.