flake: move documentation building from CI to flake check

.github/workflows/check.yml

@@ -21,4 +21,3 @@ jobs:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
       - run: nix flake check --all-systems --builders ""
       - run: nix flake check --all-systems --builders "" ./templates/_wrapper/simple --no-write-lock-file
-      - run: nix build .#docs --show-trace --builders ""

flake-modules/checks.nix

@@ -1,31 +1,38 @@
 {
   perSystem = {
     pkgs,
+    config,
     makeNixvimWithModuleUnfree,
     makeNixvimWithModule,
     ...
   }: {
-    checks = {
-      tests = import ../tests {
-        inherit pkgs;
-        inherit (pkgs) lib;
-        makeNixvim = configuration:
-          makeNixvimWithModuleUnfree {
-            module = {
-              config = configuration;
+    checks =
+      {
+        tests = import ../tests {
+          inherit pkgs;
+          inherit (pkgs) lib;
+          makeNixvim = configuration:
+            makeNixvimWithModuleUnfree {
+              module = {
+                config = configuration;
+              };
             };
-          };
-      };
+        };
 
-      extra-args-tests = import ../tests/extra-args.nix {
-        inherit pkgs;
-        inherit makeNixvimWithModule;
-      };
+        extra-args-tests = import ../tests/extra-args.nix {
+          inherit pkgs;
+          inherit makeNixvimWithModule;
+        };
 
-      lib-tests = import ../tests/lib-tests.nix {
-        inherit pkgs;
-        inherit (pkgs) lib;
-      };
-    };
+        lib-tests = import ../tests/lib-tests.nix {
+          inherit pkgs;
+          inherit (pkgs) lib;
+        };
+      }
+      # Do not check if documentation builds fine on darwin as it fails:
+      # > sandbox-exec: pattern serialization length 69298 exceeds maximum (65535)
+      // (pkgs.lib.optionalAttrs (!pkgs.stdenv.isDarwin) {
+        inherit (config.packages) docs;
+      });
   };
 }