pinwheel: Fix go ENV variables

hosts/pinwheel/modules/work/default.nix

@@ -37,7 +37,9 @@ in
     ];
 
     programs.go = lib.mkIf goEnabled {
-      goPrivate = [ "$(${pkgs.coreutils}/bin/cat ${config.age.secrets.work-go-private.path})" ];
+      env = {
+        GOPRIVATE = [ "$(${pkgs.coreutils}/bin/cat ${config.age.secrets.work-go-private.path})" ];
+      };
     };
 
     programs.git = lib.mkIf gitEnabled {