TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX doesn't affect image location when using ImageFromDockerfile

Hi. I found that when I set env TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX=myrepo.com/ not all images are downloaded from our internal repository. In code we are having:

    ImageFromDockerfile().withDockerfileFromBuilder {
        it.from("consul:latest")
        ....
    })

FromStatementTrait doesn't use ImageNameSubstitutor what cause that docker pull image from dockerhub.

I've made a fix https://github.com/lukidzi/testcontainers-java/tree/fix-missing-prefix, but one test doesn't pass. It is caused by specific image scratch. My change introduce .asCanonicalNameString() and that caused image path change from scratch to scratch:latest what cause the problem. I can prepare a pull request but I am not sure how to fix this specific test. It looks like some problem with not handling tag by docker-java?. https://github.com/lukidzi/testcontainers-java/blob/fix-missing-prefix/core/src/test/java/org/testcontainers/images/builder/ImageFromDockerfileTest.java

FROM scratch:latest

15:47:06.784 INFO  org.testcontainers.images.builder.ImageFromDockerfile - Transferred 20 bytes to Docker daemon
15:47:06.855 ERROR 🐳 [localhost/testcontainers/8wafezi9leafaish] - 'scratch' is a reserved name

Could not build image: 'scratch' is a reserved name
com.github.dockerjava.api.exception.DockerClientException: Could not build image: 'scratch' is a reserved name
	at com.github.dockerjava.api.command.BuildImageResultCallback.getImageId(BuildImageResultCallback.java:78)
	at com.github.dockerjava.api.command.BuildImageResultCallback.awaitImageId(BuildImageResultCallback.java:50)
	at org.testcontainers.images.builder.ImageFromDockerfile.resolve(ImageFromDockerfile.java:141)

Inizia con FromStatementTrait e ImageFromDockerfile, quindi esegui core/src/test/java/org/testcontainers/images/builder/ImageFromDockerfileTest.java per riprodurre il comportamento del prefisso e il fallimento di scratch. Il lavoro è completo quando le immagini di base del Dockerfile utilizzano il prefisso dell’immagine configurato senza modificare la semantica riservata dell’immagine scratch.