/usr/lib/tmpfiles.d/cyrus-imapd.conf is in cyrus-common 2.5.10-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #Type Path Mode UID GID Age Argument
d /run/cyrus 0755 cyrus mail - -
d /run/cyrus/socket 0750 cyrus mail - -
|