+ root mariadb account default extra file

* pma and inbucket port presented in docker compose example file (do not use that for prod environment with this docker structure build)

src/dockerfiles/php-fpm/php81.Dockerfile

@@ -1,4 +1,5 @@
 # syntax = edrevo/dockerfile-plus
+# https://github.com/docker-library/php/blob/52062af5056d0cd91fa5ded64fad8f9c82847b49/8.1/bookworm/fpm/Dockerfile
 FROM php:8.1-fpm
 
 INCLUDE+ ./php.base.Dockerfile