Hello Guix!

I am using certbot-service-type which also brings in nginx service. Upon 
`guix system reconfigure`, I get the following:

guix system: warning: exception caught while executing 'start' on 
service 'nginx':
Throw to key `%exception' with args `("#<&invoke-error program: 
\"/gnu/store/g6nhdp7i1sr51anq86hd6adrsm5ha857-nginx-1.21.0/sbin/nginx\" 
arguments: (\"-c\" 
\"/gnu/store/2igpjf27rm92np6jn6hfrxzx5m55a468-nginx.conf\" \"-p\" 
\"/var/run/nginx\") exit-status: 1 term-signal: #f stop-signal: #f>")'.

Regards,
RG.