lib: pass inputs to ./lib

library functions now can access inputs (and their sources!)
directly, for example in order to copy their closure into
the iso registry so that evaluating the flake does not need
to fetch inputs again

flake.nix

@@ -46,7 +46,7 @@
  {
  nixosConfigurations =
  import ./hosts (nixos.lib.recursiveUpdate inputs {
- inherit pkgs system extern;
+ inherit pkgs system extern inputs;
  inherit (pkgs) lib;
  });
 
@@ -57,7 +57,7 @@
  overlay = import ./pkgs;
  overlays = lib.pathsToImportedAttrs (lib.pathsIn ./overlays);
 
- lib = import ./lib { inherit nixos pkgs self; };
+ lib = import ./lib { inherit nixos pkgs self inputs; };
 
  templates.flk.path = ./.;
  templates.flk.description = "flk template";