fix

base-images/nginx-php-fpm-main/SwooleDockerfile

@@ -29,3 +29,8 @@ RUN echo @testing http://nl.alpinelinux.org/alpine/edge/testing >> /etc/apk/repo
 
 RUN pecl install redis-stable \
     && docker-php-ext-enable redis
+
+
+RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" && \
+    php composer-setup.php --quiet --install-dir=/usr/bin --filename=composer && \
+    rm composer-setup.php
\ No newline at end of file