Add extension sockets

php-amqplib require this extension php-amqplib/php-amqplib#610

Author: williamespindola

Dockerfile

@@ -8,7 +8,7 @@ RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/reposit
 RUN apk update && apk upgrade --force  && apk add --force gnupg curl mysql-client git curl-dev libxml2-dev openssh-client mongodb
 
 # Adding PHP extensions
-RUN docker-php-ext-install pdo curl pdo_mysql dom mbstring bcmath zip opcache soap
+RUN docker-php-ext-install pdo curl pdo_mysql dom mbstring bcmath zip opcache soap sockets
 RUN docker-php-ext-enable soap
 
 # Adding composer and prestissimo