gitlab: add initial ppc64le custom-runner test

This is a plain configure build but I only run a subset of the tests
until the kinks have been worked out.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20251117115523.3993105-13-alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
3 files changed