Add ntfy module

modules/system/services/ntfy.nix

@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  ...
+}:
+let
+  cfg = config.custom.services.ntfy;
+in
+{
+  options.custom.services.ntfy = {
+    enable = lib.mkEnableOption "";
+    domain = lib.mkOption {
+      type = lib.types.nonEmptyStr;
+      default = "";
+    };
+    port = lib.mkOption {
+      type = lib.types.port;
+      default = 2586;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.ntfy-sh = {
+      enable = true;
+      settings = {
+        base-url = "https://${cfg.domain}";
+        listen-http = ":${toString cfg.port}";
+        behind-proxy = true;
+        web-root = "disable";
+      };
+    };
+  };
+}