gitlab-ci: Build Docker images if Dockerfiles have changed

The jobs that build container images and upload them to the registry do
not have to be manual any longer. By leveraging the new only-changes
feature (GitLab 11.4), we can trigger those jobs conditionally on any
alterations to the Dockerfiles.

Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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