Here are the source files for the installation of Nextcloud on Docker with Collabora.
All in one docker-compose file with nginx reverse proxy and Letsencrypt certificate deployment.
One important hint: If you are on CentOS 7, you must change the firewall zone public and add a additional rule to it.
<rule family="ipv4">
<source address="172.19.0.0/16"/>
<accept/>
</rule>Otherwise you can't connect to the Collabora container. Set the subnet with your docker container network subnet.
You will find the public.xml source file in the repository.