This looks great and the self hosting instructions are fine too. But I think the Apps don‘t support using your own server yet, right?
edit: found it: https://github.com/ente-io/ente/tree/main/server#self-hostin...
Currently you've to pass build time flags[1] to modify the endpoint.
Providing an option in-app to change the endpoint is under discussion[2].
[1]: https://github.com/ente-io/ente/blob/main/server/RUNNING.md#...