Introducing the new bootc kickstart command in Anaconda

Anaconda installer now supports bootc-based bootable container images through a new kickstart command. Unlike the existing ostreecontainer command, the bootc command uses the bootc tool for both filesystem population and bootloader configuration, creating a more integrated deployment process. The feature enables installation of immutable systems from container images, with a simple kickstart file pointing to a container registry. Current limitations include lack of multi-disk support, arbitrary mount points, and authenticated registry support, though these are planned improvements.