Fix Forminator Proxy IP Check

[spelkey-ucd]

Forminator and the rt-forminator integration uses Forminator_Geo::get_user_ip() to get the user's IP. The plugin recently added a strict trusted proxy check, which is causing problems for IP detection on the main site, which uses a reverse proxy (router.library).

We need to register this proxy (169.237.102.131) through a filter:

add_filter( 'forminator_trusted_proxies', function( $proxies ) {
    $env_value = $_ENV['FORMINATOR_TRUSTED_PROXIES'] ?? '';

    if ( empty( $env_value ) ) {
        return $proxies;
    }

    foreach ( array_map( 'trim', explode( ',', $env_value ) ) as $entry ) {
        if ( $entry !== '' ) {
            $proxies[] = $entry;
        }
    }

    return $proxies;
} );

and then set an env variable with comma-separated ips: FORMINATOR_TRUSTED_PROXIES=169.237.102.131