Statics are automatically served in debug mode

So no need for adding static serving to the URLs config.
Use S3 and django-storages for static/media files

This was quite fiddly to get right. You need to ensure the EC2 instance
has a role that allows the appropriate write access to the S3 bucket.
The Docker container will automatically pick up the access and secret
key - there is no need to specify them.

We use custom storage classes to allow prefixes within the bucket for
storage.
Tag release images with registry name

So they can be pushed without re-tagging.