enable runner cache

nixos/boxes/cupsnet/gitea-runner.nix

@@ -21,7 +21,10 @@ in {
   virtualisation.docker = {
     enable = true;
     autoPrune.enable = true;
-    daemon.settings = {};
+    daemon.settings = {
+      fixed-cidr-v6 = "fd00::/80";
+      ipv6 = true;
+    };
   };
 
   services.gitea-actions-runner = {
@@ -33,6 +36,11 @@ in {
       name = "cupsnet local";
       settings = {
         runner.capacity = 2;
+        container.network = "host";
+        cache = {
+          enabled = true;
+          port = 40135;
+        };
       };
       hostPackages = with pkgs; [
         bash