[Dovecot] Add new imapsync + dependencies

[Dovecot] Syslog-ng: Do not trim after each push to Redis
[Dovecot] Add new cronjob to trim all Redis logs every minute (will be moved in the future)

data/Dockerfiles/dovecot/syslog-ng.conf

@@ -30,14 +30,6 @@ destination d_redis_f2b_channel {
     command("PUBLISH" "F2B_CHANNEL" "$MESSAGE")
   );
 };
-destination d_redis_cleanup {
-  redis(
-    host("redis-mailcow")
-    persist-name("redis3")
-    port(6379)
-    command("LTRIM" "DOVECOT_MAILLOG" "0" "`LOG_LINES`")
-  );
-};
 filter f_mail { facility(mail); };
 filter f_not_watchdog { not message("172\.22\.1\.248"); };
 log {
@@ -47,5 +39,4 @@ log {
   filter(f_mail);
   destination(d_redis_ui_log);
   destination(d_redis_f2b_channel);
-  destination(d_redis_cleanup);
 };