ISPyB credentials still need to be passed in as an environment variable to load the ISPyB database correctly

[tieneupin]

While trying to run a Murfey server locally, I noticed that the existing visits weren't displaying correctly. Upon further investigation, I have narrowed it down to this code block:

python-murfey/src/murfey/server/ispyb.py

Lines 40 to 45 in 368dd2f

	try:
	Session = sqlalchemy.orm.sessionmaker(
	bind=sqlalchemy.create_engine(url(), connect_args={"use_pure": True})
	)
	except AttributeError:
	Session = lambda: None

When the ISPYB_CREDENTIALS environment variable is not set, the database fails to load. It looks like the ISPyB credentials that we are providing as part of the security configuration file aren't being taken into account.

Ideally, this request to load the database should make use of the ISPyB credentials provided in the security configuration file.