Merge topic 'rel-sunos' into release-4.0

5dd973f900 ci: Convert sunos packaging jobs to build sunos-{x86_64,sparc64} binaries
fd1907e50e Utilities/Release: Convert base images to build sunos-{x86_64,sparc64}

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !10401