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

       … while evaluating derivation 'container-test-ubuntu-26-04-sops-needed-for-users'
         whose name attribute is located at «github:NixOS/nixpkgs/867dcbc30bafe3c862ef88620f2e7a109d7d3be5?narHash=sha256-9dkt1i5JNbEfPb%2BEjLcSDNs8zqEHQ/1JlSaKgj0SBAg%3D»/pkgs/stdenv/generic/make-derivation.nix:651:11

       … while evaluating attribute 'buildCommand' of derivation 'container-test-ubuntu-26-04-sops-needed-for-users'
         at «git+file:///var/lib/nixbot/worktrees/45-468119f50f85-71?ref=HEAD&rev=6fb70e3d4ad4182279632ced9699837e7b87498c»/lib/container-test-driver/default.nix:106:7:
          105|
          106|       buildCommand = ''
             |       ^
          107|         mkdir -p $out

       … while evaluating the option `environment.systemPackages':

       … while evaluating definitions from `/nix/store/pkp07s65ihkh79mllwjhia880ihhawd6-source/nix/modules/upstream/nixpkgs/users-groups.nix':

       … while evaluating the option `users.users.nobody.shell':

       … while evaluating the module argument `pkgs' in "/nix/store/pkp07s65ihkh79mllwjhia880ihhawd6-source/nix/modules/upstream/nixpkgs/users-groups.nix":

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

       … while evaluating definitions from `/nix/store/pkp07s65ihkh79mllwjhia880ihhawd6-source/nix/lib.nix:66:75: inline module':

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

       error: expected a set but found a string: "x86_64-linux"