fix: disable cachix

modules/buildbot/default.nix

@@ -1,4 +1,9 @@
-{ lib, config, ... }:
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
 with lib;
 let
   cfg = config.luj.buildbot;
@@ -31,6 +36,15 @@ in
       evalWorkerCount = 10; # limit number of concurrent evaluations
     };
 
+    systemd.services.buildbot-worker.path = lib.mkForce [
+      pkgs.attic
+      pkgs.git
+      pkgs.openssh
+      pkgs.gh
+      pkgs.nix
+      pkgs.nix-eval-jobs
+    ];
+
     services.nginx.virtualHosts."ci.julienmalka.me" = {
       forceSSL = true;
       enableACME = true;