Installing cage and cagebreak for testing

nixos/wayland.nix

@@ -31,6 +31,14 @@
     fira-code-symbols
     dina-font
   ];
+  services.cage = {
+    enable = true;
+    extraArguments = [
+      "-m extend"
+    ];
+    program = "${pkgs.foot}/bin/foot";
+    user = "ii";
+  };
   programs = {
     river = {
       enable = true;
@@ -50,6 +58,7 @@
   ];
   environment.systemPackages = with pkgs; [
     bemenu
+    cagebreak
     foot
     mako
     swaylock