Integrate gitlab-ci/add_qt-multi-screen-compositor_project and 1 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@383a5aca

Added qt-multi-screen-compositor to project list

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@3e88ad8e

buildfng: Moved the image and distro variables to global

The image and distro for the buildfng job can now be set via
global/external variables.