Odd config problem in Debian Bullseye / dovecot 2.3.13

Hi all!

For a long time, I've been running this out of cron as user "perry":

/usr/bin/doveadm expunge -u perry mailbox SPAM not seen before 7d

After upgrading to 2.3.13 as a result of a debian upgrade, this broke. I now am suddenly getting:

doveconf: Fatal: Error in configuration file /etc/dovecot/dovecot.conf line 132: ssl_key: Can't open file /etc/ssl/private/ssl-cert-snakeoil.key: Permission denied

Attempting things like setting "-o ssl_key=/dev/null" and the like don't work.

I could of course run this as root but I'd strongly prefer not to.

Anyone have any ideas?

Perry