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Like the intermediate images, this one has the <none> value for the REPOSITORY and TAG. As we can see here, the id of this dangling image, 47c736deb8d1, is the one that was previously linked to the tag myapp:1.0.
the container is committed into an image (that is an intermediate image) that will be used as the base image of the next step
changes corresponding to the instruction defined in the step are done inside of this container