gitlab: drop 'containers-layer2' stage

gitlab: drop 'containers-layer2' stage

Since we express dependencies via a 'needs' clause, we don't need to
split container builds into separate stages. GitLab happily lets jobs
depend on other jobs in the same stage and will run them when possible.

Acked-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220722130431.2319019-4-berrange@redhat.com>
[AJB: fix typo]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220725140520.515340-4-alex.bennee@linaro.org>