Add the NixNG syncthing container

Signed-off-by: Magic_RB <magic_rb@redalder.org>

flake.nix

@@ -58,6 +58,8 @@
         nixng/containers/email/dovecot.nix
         nixng/containers/email/postfix
         nixng/containers/ds3os
+        nixng/containers/syncthing
+
         overlays/udp-over-tcp.nix
         overlays/emacsclient-remote
         overlays/magic-screenshot

nixng/containers/syncthing/default.nix

@@ -0,0 +1,24 @@
+{ inputs, ... }:
+{
+  flake.nixngConfigurations.syncthing = inputs.nixng.nglib.makeSystem {
+    system = "x86_64-linux";
+    name = "ra-systems-syncthing";
+    inherit (inputs) nixpkgs;
+    config =
+      { pkgs, ... }:
+      {
+        dumb-init = {
+          enable = true;
+          type.services = {};
+        };
+        init.services.syncthing = {
+          shutdownOnExit = true;
+        };
+
+        services.syncthing = {
+          enable = true;
+          guiAddress = "http://0.0.0.0:8384/";
+        };
+      };
+  };
+}