Add hydra build

flake.nix

@@ -164,7 +164,10 @@
 
               src = self;
 
-                  buildPhase = "mkdocs build -d $out";
+              buildPhase = ''
+                mkdocs build -d $out
+                echo "doc wiki $out" >> $out/nix-support/hydra-build-products
+              '';
 
               installPhase = ''
                 mkdir -p $out/assets/fonts
@@ -185,5 +188,13 @@
           ${pkgs.miniserve}/bin/miniserve --index index.html ${packages.wiki}
         '';
       };
+
+      # My hydra only has x86_64-linux builders
+      hydraJobs =
+        if builtins.elem system [ "x86_64-linux" ]
+        then {
+          build = packages.wiki;
+        }
+        else { };
     });
 }