Add remote configuration for Xdebug

Dockerfile

@@ -4,6 +4,13 @@ RUN apk add --update --no-cache make $PHPIZE_DEPS && \
 	pecl install redis xdebug-2.5.5 && \
 	docker-php-ext-enable redis xdebug
 
+RUN echo $'\
+xdebug.remote_autostart=1\n\
+xdebug.remote_enable=1\n\
+xdebug.remote_host=host.docker.internal\n\
+' >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+
+ENV PHP_IDE_CONFIG serverName=cldr-tests
 ENV COMPOSER_ALLOW_SUPERUSER 1
 
 RUN curl -o /tmp/composer-setup.php https://getcomposer.org/installer && \

README.md

@@ -973,7 +973,8 @@ later be cleaned with the `make clean` command.
 
 To ensure tests are running with the minimum requirements, it is advised to run them inside the
 provided container. The container is started with the `make test-container` command. Once inside the
-container, `make test` and `make test-coverage` can be used.
+container, `make test` and `make test-coverage` can be used. Xdebug is available in the container
+and ready for debugging, it uses the servername `cldr-tests` and the absolute path `/app`.
 
 The package is continuously tested by [Travis CI](http://about.travis-ci.org/).