doveadm expunge unnecessarily tries to access TLS key

[Jesper Dybdal]

I have just upgraded my Debian Buster (Dovecot 2.3.4, I think it was) to 
Bullseye (Dovecot 2.3.13).

The Dovecot server works fine, which of course is the really important 
thing.

But I have a cron job that cleans up all old mail from the mailbox that 
I use for my mobile phone by running "doveadm expunge" every night.

That worked fine in 2.3.4, but now it fails:
> jdmobile at nuser:~$ doveadm expunge  mailbox '*' before 25d
> doveconf: Fatal: Error in configuration file 
> /etc/dovecot/conf.d/10-ssl.conf line 23: ssl_cert: Can't open file 
> /etc/letsencrypt/live/nuser.dybdal.dk/fullchain.pem: Permission denied

Of course, doveadm cannot access the TLS key when running as a normal 
user.  But why should it try to access that key at all when I have just 
asked it to clean up my own files in my own Maildir?  Is there a way to 
make it not try to access that key and do its job anyway?  Or another 
way to delete old mail?

(I could give it a "-u jdmobile" option and run it as root - but I 
really like to run things like that as a non-privileged user, so I won't 
make a stupid mistake that destroys the wrong mailbox.)

Thanks,
Jesper

-- 
Jesper Dybdal
https://www.dybdal.dk