recreate initramfs and update grub entries

prepare_newkernel.sh

    #!/bin/bash
    KERNEL_VERSION=$(ls -t /lib/modules/ |grep 'bootstrap\|jwrdegoede' |head -n 1)
    
    # recreate initramfs image
    if [ -f /usr/sbin/update-initramfs ]; then
      update-initramfs -c -k ${KERNEL_VERSION} || update-initramfs -u -k ${KERNEL_VERSION}
    elif [ -f /usr/bin/dracut ]; then
      dracut -f /boot/initrd.img-${KERNEL_VERSION} ${KERNEL_VERSION}
    elif [ -f /usr/bin/mkinitcpio ]; then
      mkinitcpio -c /etc/mkinitcpio.conf -g /boot/initrd.img-${KERNEL_VERSION} -k ${KERNEL_VERSION} || true
    fi
    
    # Update grub config
    if [ -f /usr/bin/grub-mkconfig ]; then
      grub-mkconfig -o /boot/grub/grub.cfg
    fi