ci: verify that `meta.maintainers` evaluate

Fixes #2588

.github/workflows/test.yml

@@ -24,6 +24,7 @@ jobs:
           echo "Error: literalExample should be replaced by literalExpression" > /dev/stderr
           exit 1
         fi
+    - run: nix-build -A docs.jsonModuleMaintainers
     - run: ./format -c
     - run: nix-shell . -A install
     - run: nix-shell --arg enableBig false --pure tests -A run.all

default.nix

@@ -5,6 +5,7 @@ rec {
     html = manual.html;
     manPages = manPages;
     json = options.json;
+    jsonModuleMaintainers = jsonModuleMaintainers; # Unstable, mainly for CI.
   };
 
   home-manager = pkgs.callPackage ./home-manager { path = toString ./.; };

docs/default.nix

@@ -117,4 +117,14 @@ in {
   manPages = docs.manPages;
 
   manual = { inherit (docs) html htmlOpenTool; };
+
+  # Unstable, mainly for CI.
+  jsonModuleMaintainers = pkgs.writeText "hm-module-maintainers.json" (let
+    result = lib.evalModules {
+      modules = import ../modules/modules.nix {
+        inherit lib pkgs;
+        check = false;
+      } ++ [ scrubbedPkgsModule ];
+    };
+  in builtins.toJSON result.config.meta.maintainers);
 }