cli: expose users database configuration option
cli: expose users database configuration option

make possible to use --users-db to configure users databse url.

ael-code/libreant,leophys/libreant,insomnia-lab/libreant,leophys/libreant,leophys/libreant,ael-code/libreant,insomnia-lab/libreant,insomnia-lab/libreant,leophys/libreant,ael-code/libreant,insomnia-lab/libreant,ael-code/libreant