Added Magento Enterprise environment variable to toggle support for Enterprise installations using Composer

docker-compose.yml

@@ -64,3 +64,4 @@ setup:
     - M2SETUP_VERSION=2.1.2
     - M2SETUP_USE_SAMPLE_DATA=false
     - M2SETUP_USE_ARCHIVE=true
+    - M2SETUP_USE_COMPOSER_ENTERPRISE=false