Seafile Rock-On upstream image no longer works

[FroggyFlox]

Thanks to forum user @silviucc for reporting this issue:
https://forum.rockstor.com/t/cant-install-seafile-rockon/10353

The current Seafile Rock-On install fails with: manifest for seafileltd/seafile-mc:latest not found when trying to pull the image. This is because upstream has moved to using versioned latest tags: 10.0-latest, 11.0-latest, 12.0-latest.
Current version seems to be 12.0, and its docker install is detailed/documented at: https://manual.seafile.com/12.0/setup/setup_ce_by_docker/

Its settings are split into 3 files:
https://manual.seafile.com/12.0/docker/ce/env
https://manual.seafile.com/12.0/docker/ce/seafile-server.yml
https://manual.seafile.com/12.0/docker/caddy.yml

The first is just a collection of ENV that we can pick and choose from; no issue there, it seems.
The second is the docker-compose file with all settings and volumes required. Note the use of multi-containers "linked" together with a docker network. This could be problematic for us at this point.
The third is the docker-compose file for the reverse proxy they now use: caddy. Note the use of ports 80 and 443 and the docker network of file 2.