Managing the building of children images in case of parent failures

[valegagge]

Currently, within our image building pipeline, a github action triggers the build of one or more docker image, which then, depending on how the build is configured for that image, triggers all related children images.

This is fine for the case when the image builds correctly, but in a case of a failure, the trigger of the build of the children still goes on (which will eventually also fail).

We need to make sure that if there is an error while building an image, all subsequent builds are not triggered.