grafana dashboard fixes

systems/x86_64-linux/jallen-nas/users.nix

@@ -52,6 +52,11 @@ in
         group = "nextcloud-exporter";
         extraGroups = [ "keys" ];
       };
+
+      # Prometheus reads bearer_token_file for the Gitea scrape job at runtime.
+      prometheus = {
+        extraGroups = [ "keys" ];
+      };
     };
 
     groups.nextcloud-exporter = { };