Thank you for linking the thread. There is a post in there explaining that there is an option for Action → Partial import/Partial export in the top right of Realm Settings, which I had missed until now.
This exports a lot of configurations, so now I am wondering a few more things. Is there a particular reason for why this isn’t in the documentation page on importing/exporting? For example is this somehow a different procedure? With the admin GUI there is no option to export users, whereas the commands in the docs indicate that this is possible with the CLI commands.
Also, in the case that I did create the custom image to run the container with another command as suggested, that seems only to be about importing configurations. So am I right in thinking that I should be exporting my configs manually but importing automatically on every container startup?