[bug#57345] [PATCH] Add gnupg to propagated-inputs of trezor-agent

[Marek Paśnikowski]

I give up.

So far, the cleanest workaround is to explicitly declare `gnupg` installation.
I decided to use that going forward.

```
(inputs (list gnupg guile-2.0 python-3 python-trezor python-trezor-agent))

(add-before 'check 'wrap-more
  (lambda* (#:key inputs outputs #:allow-other-keys)
    (wrap-script (string-append #$output "/bin/trezor_agent.py")
      '("PATH" ":" prefix 
'("/gnu/store/3bpq5knfvzhxhqfwzqm9br917nz7r0yp-gnupg-2.2.32/bin")))))
```

This is as far as I was able to go while maintaining any sense of understanding 
and control over the code.
All attempts to progress end with this failure:

```
Backtrace [...]

ERROR:
  1. &wrap-error:
      program: 
"/gnu/store/rb3wzd5pi899mlvv4wj35afc4z8ys60m-trezor-agent-0.14.4/bin/trezor_agent.py"
      type: no-interpreter-found
```

Clearly, the wrapping documentation assumes something and fails to mention it - 
and now a programming noob like me is totally lost.

My conclusions:
1. Current state of `trezor-agent` - broken critical functionality by default.
2. Presence of `gnupg` in profile fixes the above.
3. `propagated-inputs` also fixes 1., but is not acceptable.
4. In theory, it should be possible to expose a PATH to `gnupg` in `inputs`; 
but after days of working towards it, I am still not capable of reaching this 
solution.