Please Add instructions on How to Populate database in Postgres Docker Image

[jlapreviz]

Describe the documentation issue

https://www.opencue.io/docs/getting-started/setting-up-the-database/
Populate the database
Does not include instructions on how to populate the database from within the Postgres docker image database.

Describe the enhancement

Please add instructions on how to populate the Postres database with opencue, from within a Postgres database Docker instance.

Additional context

Attempting to get opencue.io running on macOS Mojave 10.14.6, using Postgres running inside Docker.