Move Nightly-Docker-Image stage to front
Move Nightly-Docker-Image stage to front

Since we want nightly images also for failed nightly builds, stage
building it is moved to front of Nightly pipeline.

Signed-off-by: Maciej Kwiek <33c1fdf481c8e628d4c6db7ea8dc77f49f2fa5d7@covalent.io>

cilium/cilium,tgraf/cilium,cilium/cilium,eloycoto/cilium,tgraf/cilium,tklauser/cilium,eloycoto/cilium,tklauser/cilium,cilium/cilium,scanf/cilium,scanf/cilium,scanf/cilium,michi-covalent/cilium,scanf/cilium,michi-covalent/cilium,cilium/cilium,eloycoto/cilium,eloycoto/cilium,eloycoto/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,scanf/cilium,michi-covalent/cilium,michi-covalent/cilium,tgraf/cilium,tgraf/cilium,michi-covalent/cilium,eloycoto/cilium,tklauser/cilium,eloycoto/cilium,tklauser/cilium,scanf/cilium,cilium-team/cilium,cilium-team/cilium,cilium/cilium,scanf/cilium