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

       … while evaluating derivation 'structure-pi-agent-environment'
         whose name attribute is located at «https://releases.nixos.org/nixos/unstable-small/nixos-26.11pre1078218.a251c42236bb/nixexprs.tar.xz?narHash=sha256-rrj0QhcnMUa9E7%2BD0NpF4FHpTgGsOXIDkh2ruzt641c%3D»/pkgs/stdenv/generic/make-derivation.nix:651:11

       … while evaluating attribute 'actualJson' of derivation 'structure-pi-agent-environment'
         at «git+file:///var/lib/nixbot/worktrees/1-848b95536c5f-38?ref=HEAD&rev=644a132b0e82c029d4a132d530ea2c51ab26de26»/modules/lib/mk-structural-check.nix:25:9:
           24|       {
           25|         actualJson = builtins.toJSON actual;
             |         ^
           26|         expectedJson = builtins.toJSON expected;

       … while evaluating the option `home.activation.installPackages.data':

       … while evaluating definitions from `/nix/store/xnygwnm7n6j5rnnwb4dcp0i2hlwq5amj-source/modules/home-environment.nix':

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

       error: Refusing to evaluate package 'tmate-unstable-2022-08-07' in /nix/store/fv9q2q4cbd2adhnjvlvczjaqzyyw1fdk-source/pkgs/by-name/tm/tmate/package.nix:55 because it is marked as insecure

       Known issues:
        - There are no upstream releases since 2019-11.
        - CVE-2018-19387

       You can install it anyway by allowing this package, using the
       following methods:

       a) To temporarily allow all insecure packages, you can use an environment
          variable for a single invocation of the nix tools:

            $ export NIXPKGS_ALLOW_INSECURE=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

       b) for `nixos-rebuild` you can add ‘tmate-unstable-2022-08-07’ to
          `nixpkgs.config.permittedInsecurePackages` in the configuration.nix,
          like so:

            {
              nixpkgs.config.permittedInsecurePackages = [
                "tmate-unstable-2022-08-07"
              ];
            }

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
          ‘tmate-unstable-2022-08-07’ to `permittedInsecurePackages` in
          ~/.config/nixpkgs/config.nix, like so:

            {
              permittedInsecurePackages = [
                "tmate-unstable-2022-08-07"
              ];
            }