Run playbook/tests during a bootc container build for a simple role like "sudo" (which does not touch services, and should work almost unmodified).

This should work fine in a GH workflow or TF, there are no unusual environment requirements. This is a good warm-up exercise for me to brush up my knowledge about the current project structure, learn about the testing playbooks, how to run them locally, and so on. Hence I allocate a few days for that.

Deliverable: At least a draft PR which shows that it's working. We may not actually land that yet, but wait for the next steps to get a coherent picture of how it should eventually look like.