error:
       … while evaluating a branch condition
         at «string»:25:5:
           24|     v:
           25|     if !builtins.isAttrs v || isDrv v then
             |     ^
           26|       v

       … in the left operand of the OR (||) operator
         at «string»:25:28:
           24|     v:
           25|     if !builtins.isAttrs v || isDrv v then
             |                            ^
           26|       v

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

       error: undefined variable 'cacert'
       at «git+file:///var/lib/nixbot/worktrees/13-07524b31762c-83?ref=HEAD&rev=3b3a91fab6c7a4ffcde192a609e7a923733f3f5b»/default.nix:56:63:
           55|           postInstall = old.postInstall or "" + ''
           56|             find . -type f -name cacerts.pem -exec ln -sfn '${cacert}/etc/ssl/certs/ca-bundle.crt' {} \;
             |                                                               ^
           57|           '';