Task #8732: [EPIC] As a user, I can rest easy with all sensitive credentials in the database encrypted at rest
pulp_installer creates the db encryption key after the db is migrated
Background here: https://github.com/pulp/pulpcore/pull/1301#discussion_r680329425
pulp_installer currently creates the db key when setting up the pulp-api service:
It needs to happen before we migrate though.