docker run -it -p 8080:8080 titogarrido/composer-playground-s390x:0.19.5
or daemon mode:
docker run -dit -p 8080:8080 titogarrido/composer-playground-s390x:0.19.5
This port is based on:
https://github.com/mhart/alpine-node/blob/f4ce91eb2e624c34e25e5aa437f0d8c0c3caef2b/Dockerfile and https://github.com/hyperledger/composer/blob/master/packages/composer-playground/docker/Dockerfile