remote Builder with default as backup

modules/hardware/remoteClient.nix

@@ -11,15 +11,17 @@
       sshUser = "nixremote";
       sshKey = config.age.secrets."keys/nixremote".path;
       maxJobs = 1;
-      speedFactor = 8;
+      speedFactor = 4;
       publicHostKey = "c3NoLWVkMjU1MTkgQUFBQUMzTnphQzFsWkRJMU5URTVBQUFBSUVnbld5UVVVYSt2Y0hBS3g2ZWRiVGdxVzhwaCtNQ2lTNmZVd1lqWWNTK28gcm9vdEBoYWRlcwo=%";
       protocol = "ssh-ng";
     } ];
     settings = {
       trusted-public-keys = [
+        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
         "hades-builder:AFdPgi6Qq/yKqc2V2imgzMikEkVEFCrDaHyAmOJ3MII="
       ];
       substituters = [
+        "https://cache.nixos.org"
         "ssh-ng://hades"
       ];
     };