bug#58746: guix pull fails in power saving profile

[two]

hello, 
i have a bug on debian:
when power profile is set to power saving, guix pull fails after computing 
derivation:

```
Computing Guix derivation for 'x86_64-linux'... /
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'...   
0.0%guix substitute: error: TLS error in procedure 
'write_to_session_record_port': Error in the push function.
guix pull: error: `/gnu/store/...-guix-command substitute' died unexpectedly
```

this happens with the default ci substitute too

when guix pull is restarted, derivation is recomputed again, so this takes time 
to reproduce