FileStorage is in werkzeug.datastructures, this didn't get caught by
mypy due to lack of type hints.
AdminFlaskApp now loads the configuration earlier, otherwise the
connection to other systems gets started with the wrong values.
While there, use .update since values from the environment are exactly what
we want to be using and the way it was written, they are expected to be
set up.
We also had swapped creation of the admin.lib.admin.Admin object and
processing admin.lib.postup.Postup; which loads some secrets needed for
moodle.
4421c5a5df