Update base image to mailserver2/debian-mail-overlay:1.0.4 (mailserve…

…r2#31)

fixed some more log rotation warnings

bump rspam version, skalibs and execline. New configuration option 'D…

…ISABLE_VHOSTS_OWNERSHIP_SET'

version bump for base image update

bump image version to 1.0.1

Bump to new base image version

Added compression to Dovecot IMAP (mailserver2#13)

* added imap compression to dovecot

* when we don't have images, we don't need to fail

* refactor zlib and imap compression

* fixed test

Co-authored-by: Istvan Szabo <sknight80@users.noreply.github.com>