nixos/repart-verity-store: init

This module provides some abstraction for a multi-stage build to create
a dm-verity protected NixOS repart image.

The opinionated approach realized by this module is to first create an
immutable, verity-protected nix store partition, then embed the root
hash of the corresponding verity hash partition in a UKI, that is then
injected into the ESP of the resulting image.
The UKI can then precisely identify the corresponding data from which
the entire system is bootstrapped.

The module comes with a script that checks the UKI used in the final
image corresponds to the intermediate image created in the first step.
This is necessary to notice incompatible substitutions of
non-reproducible store paths, for example when working with distributed
builds, or when offline-signing the UKI.

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