feat: IPv6 (#192)

* feat: custom ipv6 routes for all hosts
* fix: ipv6 - k3s+cilium

lib/genK3sAgentModule.nix

@@ -8,6 +8,15 @@
   package = pkgs.k3s;
 in {
   environment.systemPackages = [package];
+
+  # Kernel modules required by cilium
+  boot.kernelModules = ["ip6_tables" "ip6table_mangle" "ip6table_raw" "ip6table_filter"];
+  networking.enableIPv6 = true;
+  networking.nat = {
+    enable = true;
+    enableIPv6 = true;
+  };
+
   services.k3s = {
     enable = true;
     inherit package tokenFile;