error:
       … while calling the 'derivationStrict' builtin
         at «nix-internal»/derivation-internal.nix:37:12:
           36|
           37|   strict = derivationStrict drvAttrs;
             |            ^
           38|

       … while evaluating derivation 'nixbot-worker-boot-test'
         whose name attribute is located at «github:nixos/nixpkgs/1d060086d60cb76a40cf37109f979d88a5bd6396?narHash=sha256-jQp1wKvbwWdLBASTXkSi/VYmDJ5AbBi1WvcMt9HWJC8%3D»/pkgs/stdenv/generic/make-derivation.nix:651:11

       … while evaluating attribute 'NIXBOT_TEST_MEMORY_MIB' of derivation 'nixbot-worker-boot-test'
         at «git+file:///var/lib/nixbot/worktrees/1-9469ff6aefe1-3208?ref=HEAD&rev=120e128974724c9534c7a0b8c3e982d29392f815»/hosts/nixbot-worker/image.nix:85:9:
           84|         requiredSystemFeatures = [ "nixos-test" ];
           85|         NIXBOT_TEST_MEMORY_MIB = if browserWorker then "8192" else "3072";
             |         ^
           86|       }

       … while evaluating the module argument `browserWorker' in "/nix/store/6sg19ygx1lrhb579n4s7zqrrvqrmrp56-source/hosts/nixbot-worker/image.nix":

       … noting that argument `browserWorker` is not externally provided, so querying `_module.args` instead, requiring `config`

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute 'browserWorker' missing
       at «github:nixos/nixpkgs/1d060086d60cb76a40cf37109f979d88a5bd6396?narHash=sha256-jQp1wKvbwWdLBASTXkSi/VYmDJ5AbBi1WvcMt9HWJC8%3D»/lib/modules.nix:746:13:
          745|             "noting that argument `${name}` is not externally provided, so querying `_module.args` instead, requiring `config`"
          746|             config._module.args.${name}
             |             ^
          747|           )