Updating buildstream is non-trivial with bst-here
Currently, upgrading buildstream to the latest version when using bst-here
requires the user to run sudo docker pull buildstream/fedora:latest
- while not impossible, not having to know about the image and not having to know about docker is more or less the point of this script.
For now, I added a MR that adds a '-u' flag, but perhaps we should automatically upgrade whenever the script is run.