Add Dockerfile to run PHPUnit.

Author: Potherca

Dockerfile

@@ -0,0 +1,19 @@
+ARG PHP_VERSION
+FROM php:${PHP_VERSION}
+
+RUN apk add --no-cache \
+    libpng \
+    libpng-dev \
+    ${PHPIZE_DEPS} \
+  && docker-php-ext-install gd \
+  && pecl install xdebug-2.5.5 \
+  && docker-php-ext-enable xdebug \
+  && apk del libpng-dev ${PHPIZE_DEPS}
+
+COPY --from=composer /usr/bin/composer /usr/bin/composer
+
+ENV XDEBUG_MODE coverage
+
+WORKDIR /code
+
+CMD ["php", "./vendor/bin/phpunit"]