Currently, this package tests for all docker images with the string `beat` on its name. This potentially includes anything produced inside the beat gitlab group. Currently, we have an image that is produced to serve as the basis for compiling another project and 5 version of it are installed on the docker daemon. This results in probing a bunch of useless images and waste time on the CI. As a consequence, many tests are failing. I propose we just restrict these to images containing the substring `beat.env.` instead.