PostgreSQL requirement

[r0ue]

Describe the bug
I can't configure ~/.variantvalidator not to require a [postgres] database

To Reproduce
I have the code installed. The mysql database is configured.
We don't have postgresql available on our cluster and the documentation suggested it was optional.
I'd like to run without it if possible, but do not see a way forward to do so

Expected behavior
I'd like confirmation that postgres is option and how to exclude it in the configuration.
If it's not really optional, I'd like confirmation of that, then I can see if there's any way I can convince our site admins to spin up an instance.

Screenshots

Additional context

[Peter-J-Freeman]

@r0ue . The Postgres database is required. Do you have docker? If so, the best way to install is to use https://github.com/openvar/rest_variantValidator/blob/master/docs/DOCKER.md. You can either install the entirity of the API in docker and use local calls, or you can start the databases in docker and connect via the exposed ports. Or you could just spin up the postgres container in docker and connect. Quite a few options. Let me know if docker is available