This container creates a rootfs. It has installed livemedia-creator in a Centos 8 minimal based image. An example here
# working dir
├── centos8-minimal.ks
# run
docker run --rm --privileged -v "$PWD:/build:z" \
-e BUILD_KICKSTART=centos8-minimal.ks \
-e BUILD_ROOTFS=centos8-minimal.tar.xz \
quay.io/eucariop/rootfs-builder