Your ROOT_URL in app.ini is https://git.cloudchain.link/ but you are visiting https://dash.bss.nz/open-source-mirrors/overseerr/commit/475314c87bd0a79419702802a4d04787ef764f65
You should set ROOT_URL correctly, otherwise the web may not work correctly.
You can then add a jail using this filter in `jail.local`. Please see the [Fail2ban documetation](https://www.fail2ban.org/wiki/index.php/MANUAL_0_8#Jails) for details on how to configure the jail.