The test setup mechanism in meson is not flexible
enough to let us run different suites depending
on setup, so just pass in explicitly which suites
we want to skip, depending on the backend.
We want the test names in the junit xml to be
unique across all the tests in a job, so we need
to include the backend in the test name.
And we also want to see the used backend in
the html report.
We are going to need to hide the report generation into the test runner
script, as we want the job to produce the reports even in case of
failure, instead of bailing out immediately.
We should have a single job for building both static and shared
versions of GTK. On the other hand, having a separate job for the
release build would be a plus.
Additionally, we shouldn't use an opaque script to build GTK; the only
step in the process that requires hand-holding is running the tests
suites under Xvfb, and having the build options visible from the YAML
file gives us a better idea of what kind of build we're running.
