feat(zaatar): add kiosk for controlling the radio

systems/zaatar/configuration.nix

@@ -27,6 +27,35 @@
       ];
     }
     {
+      users.extraUsers.kiosk = {
+        isNormalUser = true;
+        password = "";
+        extraGroups = [ "audio" ];
+      };
+      services.cage = {
+        enable = true;
+        user = config.users.extraUsers.kiosk.name;
+        extraArguments = [ "-s" ]; # allow vt switching
+        program =
+        let startUrl = "http://localhost:${toString config.services.mpd-fm.webPort}";
+        in pkgs.writers.writeDash "kiosk-browser" ''
+          while true; do
+            ${pkgs.chromium}/bin/chromium \
+              --no-first-run --no-message-box --noerrdialogs \
+              --default-browser --no-default-browser-check \
+              --start-maximized ${startUrl}
+            sleep 0.5
+          done
+        '';
+      };
+      systemd.services.cage-tty1.environment.XKB_DEFAULT_LAYOUT = "de";
+      programs.chromium = {
+        enable = true;
+        extensions = [
+          "cjpalhdlnbpafiamejdnhcphjbkeiagm" # uBlock Origin
+        ];
+      };
+    }{
       environment.systemPackages = [ pkgs.tmux ];
       systemd.services.turntables = {
         description = "music controller session";