ci: Move bare-metal init script to common directory

Signed-off-by: Daniel Stone <daniels@collabora.com>
Acked-by: Martin Peres <martin.peres@mupuf.org>
Acked-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11337>

.gitlab-ci/bare-metal/rootfs-setup.sh

@@ -5,7 +5,7 @@ rootfs_dst=$1
 mkdir -p $rootfs_dst/results
 
 # Set up the init script that brings up the system.
-cp $BM/init.sh $rootfs_dst/init
+cp $CI_COMMON/init.sh $rootfs_dst/init
 
 cp $BM/capture-devcoredump.sh $rootfs_dst/