Add php fpm package

Can be used for development of WordPress or Magento websites. Will followup with a better default conf

Author: madalinignisca

Dockerfile.php

@@ -25,6 +25,7 @@
       php${PHP_VERSION}-curl \
       php${PHP_VERSION}-decimal \
       php${PHP_VERSION}-ds \
+      php${PHP_VERSION}-fpm \
       php${PHP_VERSION}-gd \
       php${PHP_VERSION}-gmp \
       php${PHP_VERSION}-intl \