remove unnecessary code

docker/reverb/Dockerfile

@@ -19,6 +19,6 @@ RUN apt-get update && apt-get install -y \
 
 COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
 
-WORKDIR /var/www/app
+WORKDIR /var/www/app/apps/backend
 
-EXPOSE 8080
+EXPOSE 8080