Set the release node to allow multi-user use

flake.nix

@@ -50,7 +50,7 @@
         systemd.user.services.frajtano = {
           Unit.Description = "frajtano";
           Unit.After = ["default.target"];
-          Service.Environment = "'FRAJTANO_DIR=${cfg.dir}'";
+          Service.Environment = ["'FRAJTANO_DIR=${cfg.dir}'"];
           Service.ExecStart = "${self.packages.${pkgs.system}.default}/bin/frajtano start";
           Install.WantedBy = ["default.target"];
         };