add curl

Dockerfile

@@ -6,6 +6,7 @@ USER root
 RUN apt update
 RUN apt upgrade -y
 RUN apt install php php-mbstring php-xml php-pdo php-mysql php-xdebug -y
+RUN apt install curl -y
 RUN cd /tmp
 RUN curl -sS https://getcomposer.org/installer | php
 RUN mv composer.phar /usr/local/bin/composer