Upgrade PHP to version 8.2

Author: lubo

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1.3
 
-FROM php:8.1-fpm-alpine3.18
+FROM php:8.2-fpm-alpine3.18
 RUN set -ex; \
     \
     export CFLAGS="-Os"; \
@@ -29,6 +29,7 @@ RUN set -ex; \
         imap-dev \
         libpng-dev \
         libzip-dev \
+        linux-headers \
         openldap-dev \
         openssl-dev \
     ; \

README.md

@@ -22,7 +22,7 @@ It has a few modifications:
   * EMail support
 
 osTicket is being served by [nginx](http://wiki.nginx.org/Main) using
-[PHP-FPM](http://php-fpm.org/) with PHP 8.1.
+[PHP-FPM](http://php-fpm.org/) with PHP 8.2.
 PHP [mail](http://php.net/manual/en/function.mail.php) function is configured to use
 [msmtp](http://msmtp.sourceforge.net/) to send out-going messages.