Enable testing nightly with PostgreSQL
Enable testing nightly with PostgreSQL

On CircleCI run nightly tests with the latest PostgreSQL DB

Workin on #2477

privacyidea/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea