ci: Build a docker image with dependencies and use it

Include the wayland ci-templates and libfprint templates in order to get its dependencies without having to manually keep a list of them in sync

The image generation is triggered by a project schedule, the only thing it should do is setting the FPRINT_CRON_TASK variable as BUILD_CI_IMAGES

The images are available at https://gitlab.freedesktop.org/libfprint/fprintd/container_registry (an image creation job example)