When using random names for artifacts like AWS snapshots, or Azure
images, it becomes hard to clean them up in case of CI failure. See this
issue for more details:
https://github.com/osbuild/osbuild-composer/issues/942
This PR introduces predictable names so that we can easily determine
which artifact belongs to which PR and therefore we can decide to wipe
all resources that are not needed any more.
More specifically only those that are needed in
/cmd/osbuild-image/tests.
This patch can be merged with the previous one if we want to make sure
every commit can be built, but I'm going to keep it like this for now so
that we can easily see the changes.
