feat: add PHP session handler configuration via environment variables

Author: akiletour

templates/docker-php-base.ini.tmpl

@@ -6,4 +6,5 @@ default_socket_timeout = {{ getenv "PHP_DEFAULT_SOCKET_TIMEOUT" "60" }}
 realpath_cache_size = {{ getenv "PHP_REALPATH_CACHE_SIZE" "4096K" }}
 realpath_cache_ttl  = {{ getenv "PHP_REALPATH_CACHE_TTL" "600" }}
 sendmail_path={{ getenv "PHP_SENDMAIL_PATH" "/usr/bin/msmtp -t --read-envelope-from" }}
-
+session.save_handler = {{ getenv "PHP_SESSION_SAVE_HANDLER" "files" }}
+session.save_path = {{ getenv "PHP_SESSION_SAVE_PATH" "" }}