/usr/share/live/build/cgi/live-build-cgi.crontab is in live-build-cgi 3.0~a57-1ubuntu34.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # /etc/crontab - system-wide crontab
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
# m h dom mon dow user command
*/1 * * * * root /etc/cron.hourly/live-build-cgi > /dev/null 2>&1
|