radicle-httpd: link nixos test

pkgs/by-name/ra/radicle-httpd/package.nix

@@ -10,6 +10,7 @@
   stdenv,
   xdg-utils,
   versionCheckHook,
+  nixosTests,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -66,7 +67,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
   versionCheckProgramArg = "--version";
   doInstallCheck = true;
 
-  passthru.updateScript = ./update.sh;
+  passthru = {
+    tests = { inherit (nixosTests) radicle; };
+    updateScript = ./update.sh;
+  };
 
   meta = {
     description = "Radicle JSON HTTP API Daemon";