Fix default.nix, refering to mantis flake

jonringer · craigem · commit b6a26f8624cd · 2021-04-09T18:34:23.000+10:00
diff --git a/default.nix b/default.nix
@@ -1,2 +1,4 @@
-let flake = builtins.getFlake (toString ./.);
-in flake.pkgs.${builtins.currentSystem}.defaultPackage
+let
+  flake = builtins.getFlake (toString ./.);
+in
+  flake.pkgs.${builtins.currentSystem}.mantis
