fix: wrong path

flake.nix

@@ -42,7 +42,7 @@
             version = pversion;
             # In 'nix develop', we don't need a copy of the source tree
             # in the Nix store.
-            src = ././application/source;
+            src = ./.;
 
             # This hash locks the dependencies of this package. It is
             # necessary because of how Go requires network access to resolve