fix(2fauth): export PHP_VERSION for nginx config

The PHP_VERSION variable was only available within the setup_php
function call scope. By setting it separately before the function
call, it remains available for the nginx configuration heredoc.

Fixes #11439

install/2fauth-install.sh

@@ -17,7 +17,8 @@ msg_info "Installing Dependencies"
 $STD apt install -y nginx
 msg_ok "Installed Dependencies"
 
-PHP_VERSION="8.4" PHP_FPM="YES" setup_php
+export PHP_VERSION="8.4"
+PHP_FPM="YES" setup_php
 setup_composer
 setup_mariadb
 MARIADB_DB_NAME="2fauth_db" MARIADB_DB_USER="2fauth" setup_mariadb_db