homepage-dashboard: add unixtools.ping to wrapper PATH

This gives homepage access to `ping` so it can be used
when the ping property on a service is configured

pkgs/by-name/ho/homepage-dashboard/package.nix

@@ -6,6 +6,7 @@
   pnpm_10,
   python3,
   stdenv,
+  unixtools,
   cctools,
   lib,
   nixosTests,
@@ -89,7 +90,8 @@ stdenv.mkDerivation (finalAttrs: {
       --set-default PORT 3000 \
       --set-default HOMEPAGE_CONFIG_DIR /var/lib/homepage-dashboard \
       --set-default NIXPKGS_HOMEPAGE_CACHE_DIR /var/cache/homepage-dashboard \
-      --add-flags "$out/share/homepage/server.js"
+      --add-flags "$out/share/homepage/server.js" \
+      --set PATH "${lib.makeBinPath [ unixtools.ping ]}"
 
     ${if enableLocalIcons then installLocalIcons else ""}