There is no significant benefit in keeping this configuration separated.
Now the to-be installed packages are tracked in a single place and the
test playbooks only call the relevant tests.
This was pointed out by in 6063eb27b9https://github.com/containers/toolbox/pull/898
Call "meson builddir" makes Meson create a build directory called
"builddir". It does not make it build the project. A subsequent call to
"meson compile" or "ninja" needs to be made. This subtle detail causes
a minor (purely visual) discrepancy in the CI output. Fix this for both
unit-test & system-test job definitions.
