gitlab: display /packages.txt in build jobs

gitlab: display /packages.txt in build jobs

The lcitool created containers save the full distro package list
details into /packages.txt. The idea is that build jobs will 'cat'
this file, so that the build log has a record of what packages
were used. This is important info, because when it comes to debug
failures, the original container is often lost.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20240724095505.33544-3-berrange@redhat.com>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240729144414.830369-3-alex.bennee@linaro.org>