CI: use wayland-ci-templates to manage the images

There shouldn't be a difference for users, but this way we do manage
all of our containers from freedesktop.org

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
3 jobs for wip/ci-templates in 6 minutes and 6 seconds (queued for 10 seconds)
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