adding cache to zerotier

common/optional/zerotier.nix

@@ -3,4 +3,9 @@
     enable = true;
     joinNetworks = [ "e4da7455b2ae64ca" ];
   };
+  nix.settings = {
+    trusted-substituters = [ "http://192.168.90.40:5000" ];
+    substituters = [ "http://192.168.90.40:5000/?priority=1&want-mass-query=true" ];
+    trusted-public-keys = [ "cache.tmmworkshop.com:jHffkpgbmEdstQPoihJPYW9TQe6jnQbWR2LqkNGV3iA=" ];
+  };
 }