Change Postgres configuration to store JWT secret

[anagradova]

Description

This command must be run to set up the database to store the JWT secret so that it is not exposed in any database functions as per the Postgrest documentation (https://postgrest.org/en/stable/auth.html)

ALTER DATABASE mydb SET "app.jwt_secret" TO 'reallyreallyreallyreallyverysafe';

User Story

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Architectural Decision Records (ADRs)

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[anagradova]

Used already in the database for the JWT_gen function. We will need to determine the maintenance process for the system in production.