add

dockerfile

@@ -5,4 +5,6 @@ USER root
 RUN apt update
 RUN apt upgrade -y
 RUN apt install php php-mbstring php-xml php-pdo php-pdo_mysql php-xdebug -y
-RUN apt install composer -y
+RUN cd /tmp
+RUN curl -sS https://getcomposer.org/installer | php
+RUN mv composer.phar /usr/local/bin/composer