setting up brain nix serve

common/optional/brain_substituter.nix

@@ -0,0 +1,6 @@
+{
+  nix.settings = {
+    trusted-substituters = [ "http://192.168.95.35:5000" ];
+    substituters = [ "http://192.168.95.35:5000/?priority=1&want-mass-query=true" ];
+  };
+}