Summary of the issue you are facing:
The Nextcloud AIO container needs a way to customize the deployed containers name so that you can actually run multiple instances without going rootless or VMs
Steps to replicate it (hint: details matter!):
- Install nextcloud-aio
- Try to deploy another one using the same docker engine on the same machine.
The second nextcloud AIO installer will tell you that the instance is already running.
Did I miss that feature somewhere in the docs ?