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kotlinlang

A nice addition might be:
```fun ConfigLoader.Builder.addSourceIf(source: PropertySource, condition: () -&gt; Boolean) = apply {
    if (condition()) addSource(source)
}```
My use case:
```ConfigLoader.Builder()
        .addSource(PropertySource.resource("/application.yaml"))
        .addSourceIf(PropertySource.resource("/application-k8s.yaml", true)) {
            System.getenv().containsKey("KUBERNETES_SERVICE_HOST")
        }
        .build()
        .loadConfigOrThrow()```
To load a k8s config file if in k8s.