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What's the most idiomatic Kotlin way of creating a database config object like the following? Do I use a `data class`, a function returning a `DbConfig` class instantiated via primary constructor, a class with an `init` block, ...?

A data class is a good way to hold the data.  How to get an instance of it depends on what framework(s) you're using.

If you're using Spring, for instance, you could annotate it with `@ConstructorBinding` and `@ConfigurationProperties` .

It looks like you're using dotenv(), which I'm not familiar with.  I would consider something like this:
```data class DbConfig(
    val port: Int,
    val name: String,
    val user: String,
    val password: String,
)

fun Dotenv.loadDbConfg() =
   DbConfig(
      port = get("POSTGRES_PORT").toInt(),
      name = get("POSTGRES_DB"),
      user = get("POSTGRES_USER"),
      password = get("POSTGRES_PASSWORD"),
   )```

Then you can use `val dbConfig = dotenv().loadDbConfig()`

Ah, I see, an extension method, that's neat. Thanks for the tip, I'll use that!

There's always <#C018GCM5PS6|hoplite>, if you want a full featured solution.