No problem. It should be working 
.
Yep, that Dockerfile line will indeed copy the files across (you can check if you run fly ssh console you should be able to SSH-in to your app’s vm, and look around its file system to make sure).
As regards paths, yes, relative ones should be the same. I just wondered if there were any absolute ones, which wouldn’t be the same on your local machine vs a Fly vm e.g
http://whitenoise.evans.io/en/stable/django.html#WHITENOISE_ROOT