Docker jitsi-meet-web container details

Hi all,
In docker jitsi-meet-web , in the docker file :

ARG JITSI_REPO=jitsi
FROM ${JITSI_REPO}/base

RUN \
	apt-dpkg-wrap apt-get update && \
	apt-dpkg-wrap apt-get install -y cron nginx-extras jitsi-meet-web && \
	apt-dpkg-wrap apt-get install -y -t stretch-backports certbot && \
	apt-cleanup && \
	rm -f /etc/nginx/conf.d/default.conf && \
	rm -f /usr/share/jitsi-meet/interface_config.js

COPY rootfs/ /

EXPOSE 80 443

VOLUME ["/config", "/etc/letsencrypt"]

can anyone plz explain the -

apt-dpkg-wrap apt-get install -y cron nginx-extras jitsi-meet-web

lineā€¦? in that container, is this jitsi-meet-web contains lib-jitsi-meet,UI and others? actually where is is downloading from or inside container OS how it is distributed? is this from git? so that I can make some change in the UI and also customize the lib-jitsi-meet?
@saghul
Thanx in advance :heartbeat: