In scripts/boss_test.py, add a function test_cron_trigger that tests the cron trigger by:

Creating a lambda function f.py that appends the string "cron invoked" to /tmp/cron_test_output.txt and ol.yaml that has a corn trigger that triggers this function every minute

Packaging the lambda code (f.py) and an ol.yaml and uploading it to the lambda_store.

Sleeping for 70 seconds to allow the cron to trigger.

Checking that the file /tmp/cron_test_output.txt exists and contains "cron invoked".