flake-info does not pass pkgs argument to NixOS modules

[2xsaiko]

As seen in #698 and #824. Modules such as https://git.sr.ht/~dblsaiko/nix-extras/tree/master/item/common/modules/programs/kakoune/default.nix fail eval with

error: attribute 'pkgs' missing

Notably, the errors in both packages come from usage of pkgs.formats.* in an option declaration (#824's is pkgs.formats.yaml). Might be that options types are inspected without evaluating config, specifically the NixOS module that exports the pkgs argument?

             … from call site
               at /nix/store/2pnmvlid82hrccm9qz4qxg8isjlw847n-source/common/modules/programs/kakoune/default.nix:13:10:
                 12|   cfg = config.programs.kakoune;
                 13|   toml = pkgs.formats.toml {};
                   |          ^
                 14| in {
      
             … while calling anonymous lambda
               at /nix/store/8rv7qar60c9p7hzwfa02syvl4yzrgmsm-source/lib/modules.nix:552:35:
                551|       context = name: ''while evaluating the module argument `${name}' in "${key}":'';
                552|       extraArgs = mapAttrs (name: _:
                   |                                   ^
                553|         addErrorContext (context name)
      
             … while evaluating the module argument `pkgs' in "/nix/store/2pnmvlid82hrccm9qz4qxg8isjlw847n-source/common/modules/programs/kakoune":
      
             error: attribute 'pkgs' missing
             at /nix/store/8rv7qar60c9p7hzwfa02syvl4yzrgmsm-source/lib/modules.nix:554:28:
                553|         addErrorContext (context name)
                554|           (args.${name} or config._module.args.${name})
                   |                            ^
                555|       ) (functionArgs f);