fix: add pub.solar binary cache

hosts/frikandel/wireguard.nix

@@ -16,7 +16,7 @@
   networking.nat = {
     enable = true;
     enableIPv6 = true;
-    internalInterfaces = [ "wg-server" ];
+    internalInterfaces = [ "wg0" ];
   };
 
   networking.firewall.allowedUDPPorts = [ 51899 ];

modules/nix/default.nix

@@ -30,6 +30,14 @@
       trusted-users = ["root" "@wheel"];
       # Allow only group wheel to connect to the nix daemon
       allowed-users = ["@wheel"];
+
+      substituters = [
+        "https://pub-solar.cachix.org/"
+      ];
+
+      trusted-public-keys = [
+        "pub-solar.cachix.org-1:ZicXIxKgdxMtgSJECWR8iihZxHRvu8ObL4n2cuBmtos="
+      ];
     };
 
     # Generally useful nix option defaults