Add building additional test container

Dockerfile.phptest

@@ -0,0 +1,12 @@
+# NAME leenooks/php
+# VERSION 7.4-fpm-mp
+
+FROM registry.leenook.net/leenooks/php:7.4-fpm
+
+RUN apt-get update && apt-get install -y autoconf \
+	&& pecl install xdebug \
+	&& docker-php-ext-enable xdebug \
+	&& apt-get purge autoonf \
+	&& apt-get -y autoremove \
+	&& apt-get clean \
+	&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \