Controller
Controller is for running code before and after workflows run.
All pre_/post_-functions takes a dict as an argument that is populated with all
cumulated info from earlier pre_/post_, all previous questions and configuration file.
Should return a dict or None.
from datetime import datetime
from jobbergate import workflow
@workflow.logic
def pre_(data):
# adds current datetime to data
return {'datetime': str(datetime.now())}