Fix xdebug version

Dockerfile

@@ -11,7 +11,7 @@ RUN apt-get update && apt-get install --no-install-recommends --no-install-sugge
     && ln -s /usr/lib/x86_64-linux-gnu/libldap.so /usr/lib/libldap.so \
     && ln -s /usr/lib/x86_64-linux-gnu/liblber.so /usr/lib/liblber.so \
     && docker-php-ext-install -j$(nproc) xml gd ldap mysqli pdo_mysql \
-    && pecl install timezonedb xdebug\
+    && pecl install timezonedb xdebug-2.6.0\
     && docker-php-ext-enable timezonedb xdebug\
     && curl https://getcomposer.org/download/1.8.4/composer.phar -o /usr/local/bin/composer \
     && chmod +x /usr/local/bin/composer
@@ -32,4 +32,4 @@ RUN set -ex \
     && sed -i -e "s/;request_terminate_timeout\s*=[^\n]*/request_terminate_timeout = 300/g" /usr/local/etc/php-fpm.conf \
     && php-fpm --test
 
-CMD ["/docker-entrypoint-php-fpm.sh"]
+CMD ["/docker-entrypoint-php-fpm.sh"]