TypeORM cannot connect to Remote Heroku Postgress Database

**Describe the bug**
While connecting to the Heroku Postgres server the connection is refused with an error that `SSL is not configured` and if `SSL: true in config the error is `self-signed certificate`.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to the root of the project
2. Run `npm run start:prod`
3. Wait for the nest application to be initialized.
4. See the error.

**Expected behavior**
The Server must connect to the Postgres DB with no errors.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Additional context**
Most probably the reason is that the Postgress database hosted on Heroku is configured with `ssl-only: true`.

Start at the repository root and run `npm run start:prod` to reproduce the connection failure described for the Heroku Postgres database. Compare the current connection behavior with the reported SSL errors; done means the NestJS application initializes and connects to the database without errors.

Scritto dal modello di indicizzazione a partire dal testo della issue.