ARMageddon: When Bootloader Configuration Goes Rogue

[MichalHe]

What needs to be done:

• - modify code so that /boot/efi/EFI/redhat/grub2.cfg is patched to include grubenv from the correct BLS entry
• - Create leapp's own BLS directory /boot/upgrade-loaders mimicking /boot/loaders and place there only leapp's BLS entry
• - modify grubenv in /boot/efi/EFI/leapp/grubenv (which is now properly loaded) to contain blsdir upgrade-loaders. This way, booting into the upgrade EFI entry means that user can only continue with the upgrade, and he/she cannot boot into RHEL8 (with new bootloader)

[github-actions]

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