improve startup resiliency : wait for systems.determinate.nix to mount /nix

modules/services/adguardhome.nix

@@ -116,14 +116,14 @@ in
 
   config = mkIf cfg.enable {
     launchd.daemons.adguardhome = {
+      script = ''
+        # Wait for /nix/store to be mounted
+        while [ ! -x "${lib.getExe cfg.package}" ]; do
+          sleep 1
+        done
+        exec ${lib.getExe cfg.package} -c ${configFile} --no-check-update ${builtins.concatStringsSep " " cfg.extraArgs}
+      '';
       serviceConfig = {
-        ProgramArguments = [
-          "${lib.getExe cfg.package}"
-          "-c"
-          "${configFile}"
-          "--no-check-update"
-        ] ++ cfg.extraArgs;
-
         KeepAlive = true;
         RunAtLoad = true;
         StandardErrorPath = cfg.logFile;