/usr/share/gitolite3/triggers/ is in gitolite3 3.5.3.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gitolite3/triggers/bg
/usr/share/gitolite3/triggers/partial-copy
/usr/share/gitolite3/triggers/post-compile/
/usr/share/gitolite3/triggers/post-compile/ssh-authkeys
/usr/share/gitolite3/triggers/post-compile/ssh-authkeys-shell-users
/usr/share/gitolite3/triggers/post-compile/ssh-authkeys-split
/usr/share/gitolite3/triggers/post-compile/update-description-file
/usr/share/gitolite3/triggers/post-compile/update-git-configs
/usr/share/gitolite3/triggers/post-compile/update-git-daemon-access-list
/usr/share/gitolite3/triggers/post-compile/update-gitweb-access-list
/usr/share/gitolite3/triggers/post-compile/update-gitweb-daemon-from-options
/usr/share/gitolite3/triggers/renice
/usr/share/gitolite3/triggers/repo-specific-hooks
/usr/share/gitolite3/triggers/set-default-roles
/usr/share/gitolite3/triggers/upstream