How to Connect to Apache Ignite Database
First read How to Connect to Database to understand the Connection Dialog.DbSchema already include the Apache Ignite drivers.

Run Apache Ignite in Docker Container
The docker container is described at https://apacheignite.readme.io/docs/docker-deployment.
Create the container using:
docker run --name ignite -p 47500:47500 -p 47501:47501 -p 10800:10800 -it apacheignite/ignite
In DbSchema you will have to simply enter the host value and you are connected.