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kotlinlang

hi folks,

I ran into a small issue while using Kotest and Testcontainers with the _kotest-extensions-testcontainers_ today (details in :thread:).

Following the <https://kotest.io/docs/extensions/test_containers.html#general-containers|documentation>, I tried the following:

```val container = install(ContainerExtension(GenericContainer("mycontainer:latest"))) {
    withExposedPorts(8080)
}

...

container.getMappedPort(8080)```

This code has two issues:
• The GenericContainer API has changed, so this code doesn’t compile. To fix it, the image name must be parsed: `GenericContainer(DockerImageName.parse("mycontainer:latest"))` . Should the documentation be updated?
•  Calling `getMappedPort(8080)` fails with an exception. It seems the configuration block runs only after the container starts, so it has no effect. Calling `withExposedPorts` directly on GenericContainer solves the issue. Am I missing something?
```install(ContainerExtension(GenericContainer(DockerImageName.parse("mycontainer:latest")).withExposedPorts(8080)))```