Different users (or even companies) have different interests, and
may want to run a reduced set of tests during development, or a
larger set of tests during QE.
To cover these use cases, this introduces some example (but
functional) jobs.
It's expected that some common jobs will come up from common
requirements for different users (and maybe be added to a common
location such as tests/jobs), and that very specific jobs will be
added to directories specific to certain groups, say
"contrib/com.redhat/jobs" or the like.
This series does*not* add new jobs to GitLab CI pipeline, but this is
expected to be done later on custom runners. That is, custom runners
could be used for custom jobs. Anyway, a GitLab CI pipeline can be
seen here:
https://gitlab.com/cleber.gnu/qemu/-/pipelines/287210066
This is based on the Avocado version bump patch:
https://lists.gnu.org/archive/html/qemu-devel/2021-04/msg02391.html