Fix grub2 EFI bootloader config in live cd image if removed by accident

fix-grub2-fedora.sh

# https://docs.fedoraproject.org/en-US/quick-docs/bootloading-with-grub2/#restoring-bootloader-using-live-disk
# https://docs.fedoraproject.org/en-US/quick-docs/bootloading-with-grub2/#adding-other-operating-systems-grub2
# Download fedora image and boot to live mode

sudo mkdir -p /mnt/root

sudo mount /dev/nvme1n1p3 -o subvol=root /mnt/root
sudo mount /dev/nvme1n1p2 /mnt/root/boot/
sudo mount /dev/nvme1n1p1 /mnt/root/boot/efi

sudo mount -o bind /dev /mnt/root/dev
sudo mount -o bind /proc /mnt/root/proc
sudo mount -o bind /sys /mnt/root/sys
sudo mount -o bind /run /mnt/root/run

modprobe efivarfs

sudo chroot /mnt/root

mount -t efivarfs efivarfs /sys/firmware/efi/efivars

sudo dnf instsall grub2-efi-x64-modules
sudo dnf reinstall shim-* grub2-*
sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

shutdown # Reboot with new config