Add gather-timestamps job

This job gathers the timestamps produced by the pr and nightly jobs each
day, and bundles them up into json and csv files for easy parsing.

It collects the timestamps of all jobs that have finished in the past 24
hours at 8 AM UTC.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: I4c4c52dd4969d7189d48625f60bb2eb05fc23e84
1 file changed