Initial registration won't work with a custom config.
You can either:
Supply your own `network-parameters` file and `node.conf`
Use the `config-generator` option on the container to run initial registration for you which also creates a `node.conf` file. However the `config-generator` option doesn't allow you to change many things in the `node.conf` such as database settings.
You can't use option 1 and run initial registration yourself as the node fails to start because there is no provided `network-parameters` file.