Split ci jobs in an build and update pipeline

Building the package and releasing is really a completely orthogontal pipeline from pulling updates from upstream and merging those into downstreams. As other changes are in progress such that both aspects run on different branches (with different gitlab-ci.yml files), also split out the yml files various projects include such that depending on the branch that is ran it'll either be a update or build type pipeline.

Signed-off-by: Sjoerd Simons sjoerd.simons@collabora.co.uk