renovate/lib/modules/manager/nix

The nix manager supports:

• lockFileMaintenance updates for flake.lock
• input updates for flake.lock

For specifying packageRules it is important to know how depName and packageName are defined for nix updates:

• The depName field is equal to the nix flake input name, eg. nix.inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; would have the depName of nixpkgs
• The packageName field is equal to the fully-qualified root URL of the package source, eg. https://github.com/NixOS/nixpkgs for the above example.