how to use nh in topgrade

[DrTeagle]

Howdy, I see in the code that there is support for nh but I do not see how to configure it to use nh, and how to set the NH_FLAKE

[GideonBear]

nh should automatically be used if both nix and nh are available, and if at least one of the following environment variables: NH_FLAKE, NH_DARWIN_FLAKE, NH_HOME_FLAKE, NH_OS_FLAKE; are set. These are the environment variables that nh expects (https://github.com/nix-community/nh#environment-variables). If you don't know how to set environment variables, you can do that by adding export ENVVAR=value to your ~/.bashrc or equivalent for your shell.