add dracut-catimages

add dracut-catimages

Usage: ./dracut-catimages [OPTION]... <initramfs> <base image>
[<image>...]
Creates initial ramdisk image by concatenating several images from the
command
line and /boot/dracut/

  -f, --force           Overwrite existing initramfs file.
  -i, --imagedir        Directory with additional images to add
                        (default: /boot/dracut/)
  -o, --overlaydir      Overlay directory, which contains files that
                        will be used to create an additional image
  --nooverlay           Do not use the overlay directory
  --noimagedir          Do not use the additional image directory
  -h, --help            This message
  --debug               Output debug information of the build process
  -v, --verbose         Verbose output during the build process