/usr/share/tripleo-image-elements/heat-engine/install.d/20-heat-crontab is in python-tripleo-image-elements 0.7.1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/bin/bash
# If https://bugs.launchpad.net/heat/+bug/1239377 is ever fixed we can
# configure heat to purge automatically and remove this.
cat <<EOF > /etc/cron.d/heat
30 * * * * heat heat-manage purge_deleted 1
EOF
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