CI: use wayland ci-templates repo to create the base image

CI: use wayland ci-templates repo to create the base image

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

note: compared to the provious Dockerfile, we need to manually
      add gcc, g++ and python*-wheel

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>