Modifies composer.dockerfile to hard code version 2

Author: aschmelyun

composer.dockerfile

@@ -1,5 +1,5 @@
-FROM composer:latest
+FROM composer:2
 
 RUN addgroup -g 1000 laravel && adduser -G laravel -g laravel -s /bin/sh -D laravel
 
-WORKDIR /var/www/html
+WORKDIR /var/www/html