Bind database.yml.docker to correctly (again?)

docker-compose.yml

@@ -10,6 +10,9 @@ x-app:
     - type: bind
       source: .
       target: /app
+    - type: bind
+      source: ./config/database.yml.docker
+      target: /app/config/database.yml
     - gems:/usr/local/bundle
     - node_modules:/app/node_modules
   working_dir: /app