Ensure `mix ecto.setup` (or `mix ecto.load`) succeds execution

[matiasgarciaisaia]

When running mix ecto.load, we run the script at priv/repo/structure.sql to initialize the database structure.

The issue is - if any of the queries fail, the task reports a success without logging any errors.

We should find a way to force the task to fail if any of the queries fail.