Unable to run keycloak with readme

[chevy67327]

This command failes with "/opt/jboss/tools/docker-entrypoint.sh: line 165: DB_ADDR: unbound variable"
docker run --name demo-keycloak -e KEYCLOAK_USER=admin -e KEYCLOAK_PASSWORD=admin -p 8080:8080 --net demo-network demo-keycloak

Upon googling this specific issue I added this to the dockerfile:

ENV DB_VENDOR=POSTGRES
ENV DB_ADDR=postgres
ENV DB_DATABASE=keycloak

It gets further but I get other more complicated errors:

ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation ("add") failed - address: ([("subsystem" => "microprofile-metrics-smallrye")]): java.lang.NullPointerException

It appears t hat updates to keycloak or postgresql have broken your original project.