How can I create a Postgres 16 user that has permission to create tables on an app platform dev database?

I’m trying to figure out how (or if?) I can run Postgres 16 on app platform with a Django application. I’m getting the following error message:

[2024-08-13 11:58:42] psycopg2.errors.InsufficientPrivilege: permission denied for schema public
[2024-08-13 11:58:42] LINE 1: CREATE TABLE "django_migrations" ("id" integer NOT NULL PRIM...

I understand this is because since Postgres 15 the default user doesn’t have permission to create tables, and that the solution should be to login to the database as the admin user and grant those permissions, as described in these posts:

https://www.digitalocean.com/community/questions/permission-denied-for-database-postgres-when-creating-schemas-in-dev-database https://www.digitalocean.com/community/questions/how-to-provide-access-to-a-public-scheme-in-postgresql-15-or-16-using-terraform

However, I can’t seem to find a way to get the admin user information from the dev database in app platform, so I don’t have a way to login and run this. The connection string that is visible from the app settings page is not for the admin user, and when I try to get it from the doctl databases list command or similar the database doesn’t show up anywhere.

Is there a way to do this or is it not possible to use Postgres 15+ on a dev database that needs to create tables anymore?