start-hydra: create a db for the current username

Otherwise the logs are spammed with database not existing errors:

15:46:07 postgres.1 | 2021-04-05 15:46:07.631 UTC [30742] FATAL: database grahamc does not exist 15:46:08 postgres.1 | 2021-04-05 15:46:08.641 UTC [30759] FATAL: database grahamc does not exist 15:46:09 postgres.1 | 2021-04-05 15:46:09.650 UTC [30765] FATAL: database grahamc does not exist

Created by  Graham Christensen  on April 5, 2021
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