Keyclock stops instantly after docker run command following the jboss/keycloak Docker Hub instruction

Hi, I tried to create a docker instance of Keycloak following the Docker Hub jboss/keycloak instructions. However, it stopped instantly with the following messages.

$ Status: Downloaded newer image for jboss/keycloak:latest
$ -b 0.0.0.0
$ /opt/jboss/tools/docker-entrypoint.sh: line 156: DB_ADDR: unbound variable

Also attached an image of the steps taken.

Please help and thank you in advance!