FROM ubuntu:18.04ARG DEPENDSARG GITSRCARG GITDATEARG GITCOMMIT # starting out as root, will drop back in entrypoint.shUSER root # expose ports for domain serverEXPOSE 40100 40101 40102EXPOSE 40100/udp 40101/udp 40102/udp # expose ports for assignment clientEXPOSE 48000/udp 48001/udp 48002/udp 48003/udp 48004/udp 48005/udp 48006/udp RUN echo UTC >/etc/timezoneRUN DEBIAN_FRONTEND=noninteractive apt-get update && \	apt-get install -y tzdata supervisor ${DEPENDS} && \	apt-get clean && \	rm -rf /var/lib/apt/lists/* && \	mkdir -p /var/lib/overteRUN groupadd -r overte ; \	useradd -Nr overte -d /var/lib/overte ; \	usermod -aG overte overte ; \	chown overte.overte /var/lib/overte ; \	exit 0 VOLUME /var/lib/overte RUN mkdir -p /var/run ; chmod 777 /var/runCOPY overte.conf /etc/supervisor/conf.d/overte.conf COPY entrypoint.sh /COPY opt /opt/overteCOPY lib /opt/overte/lib ENTRYPOINT ["/entrypoint.sh"]CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/overte.conf"]LABEL \	net.overte.gitsrc="${GITSRC}" \	net.overte.gitdate="${GITDATE}" \	net.overte.gitcommit="${GITCOMMIT}"