Add an exercise to episode about pushing images
Exercise could be something like this:
Exercise: Which of these 12 listed repositories and tags are based on the same Docker image as tag my-ipython-image:latest?
$ docker image list
REPOSITORY TAG IMAGE ID CREATED SIZE
1 python 3.9 3j54i421f983 1 week ago 885MB
2 my-ipython-image 0.1.0 c42929207891 1 day ago 991MB
3 my-ipython-image 0.2.0 13957d93j393 1 hour ago 995MB
4 my-ipython-image latest 13957d93j393 1 hour ago 995MB
5 ipython/nbviewer 90c61ccd c32856e2f323 1 week ago 103MB
6 registry.gitlab.com/christian.hueser.hzdr/my-ipython-image-project 0.1.0 c42929207891 1 day ago 991MB
7 registry.gitlab.com/christian.hueser.hzdr/my-ipython-image-project 0.2.0 13957d93j393 1 hour ago 995MB
8 registry.gitlab.com/christian.hueser.hzdr/my-ipython-image-project latest 13957d93j393 1 hour ago 995MB
9 jupyter/datascience-notebook latest 13485d485j21 1 week ago 1.8GB
10 christianhueserhzdr/my-ipython-image-project 0.1.0 c42929207891 1 day ago 991MB
11 christianhueserhzdr/my-ipython-image-project latest 13957d93j393 1 hour ago 995MB
12 ubuntu 20.04 13957d93j393 1 hour ago 995MBSolution: 3, 7, 8, 11, 12(!)