oci/ci

clang -> meson + ninja CI container

Available recipes:
    help                     # show this help
    debian-clang-nightly ... # clang-nightly subcommand
    debian-meson-ninja ...   # meson-ninja subcommand

    [Cleanup]
    clean                    # clean oci/ci container and images
    rm                       # remove all containers
    rmi                      # remove all images

    [Status]
    find                     # enumerate build targets
    list-images              # list built images by label
    ls                       # alias for `list-images`
    ps                       # list created container by label