Create image used for CI testing

Dockerfile.phptest

@@ -0,0 +1,12 @@
+# NAME leenooks/php
+# VERSION 8.0-fpm-test
+
+FROM registry.leenooks.net/leenooks/php:8.0-fpm-mp
+
+RUN pecl install xdebug \
+	&& docker-php-ext-enable xdebug
+
+RUN apt-get update && apt-get install -y npm \
+        && apt-get -y autoremove \
+        && apt-get clean \
+        && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*