Change in coreboot[master]: util/liveiso: Add NixOS configs for bootable live systems

[Felix Singer (Code Review)]

Attention is currently required from: Timofey Komarov, Nico Huber, Maciej Pijanowski, Michał Żygowski, Patrick Rudolph, Maxim Polyakov, Paul Menzel, Thomas Heijligen, Edward O'Callaghan, Michael Niewöhner, Krystian Hebel,  Marcello Sylvester Bauer.
 Felix Singer has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50194 )

Change subject: util/liveiso: Add NixOS configs for bootable live systems
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Patch Set 41:

(3 comments)

File util/liveiso/build-console.sh:

https://review.coreboot.org/c/coreboot/+/50194/comment/16b9ea94_03654b8b 
PS30, Line 1: bash
> reason: bash may not be installed by default (e.g. docker containers, zsh users, ... […]

Done

File util/liveiso/build-graphical.sh:

https://review.coreboot.org/c/coreboot/+/50194/comment/ca08be5d_7a246297 
PS30, Line 1: bash
> reason: bash may not be installed by default (e.g. docker containers, zsh users, ... […]

Done

File util/liveiso/description.md:

https://review.coreboot.org/c/coreboot/+/50194/comment/4803cefd_476010fd 
PS30, Line 3:
> nit: one newline is enough

Done