V2.3.0 Docker image (amd64) : Healthcheck

Hello Team

Tested the Docker image under Debian and changed the web URL in config.ini to the hostname of the VM.
After that the health check is broken, because of hardcoded URL in script scripts/Docker/roundup_healthcheck

tracker=$(ps -ef | sed -ne '/roundup-server/s/^.*\s\(\w*\)=.*$/\1/p')
wget -q -O /dev/null --no-verbose http://localhost:8080/${tracker:-demo}/

maybe there should be a environment parameter for health check like HEALTHCHECK_URL=http://tvmtmcsdebiansrv.myDomain.com:8917/
Better the " [tracker] / web" parameter from config.ini can be used instaed.

Regards
Norbert