feat: nb change building speed

hosts/nb/configuration.nix

@@ -189,6 +189,8 @@ in {
   networking.networkmanager.enable = true;  # Easiest to use and most distros use this by default.
   networking.extraHosts = ''
     77.119.230.30 vpn.cloonar.com
+    23.88.38.1 api.ebs.amz.at
+    23.88.38.1 ebs.amz.at
   '';
 
   # Set your time zone.
@@ -287,8 +289,9 @@ in {
     settings = {
       auto-optimise-store = true;
       experimental-features = [ "nix-command" "flakes" ];
-      max-jobs = 12;
-      cores = 2;
+      max-jobs = 4;
+      cores = 4;
+      max-substitution-jobs = 16;
     };
     gc = {
       automatic = true;