It is looking like we may try to do two Gerrit upgrades back to back
over a short period of time (like one week). To make that feasible we
need to be testing both the upgrade from 3.11 to 3.12 and from 3.12 to
3.13 as we won't have time to do this in the one week between upgrades.
Start this process by adding 3.13 images, a review 3.13 test job and a
3.12 to 3.13 upgrade job.
This should give us early signal on how feasible this approach will be,
and we can build atop this to do more in depth testing as we learn more
about this upgrade.
Note we simplify the selenium screenshot process through the use of url
parameters to select the zuul results summary. We do this because the
underlying html and js elements have changed between 3.12 and 3.13 and
managing multiple scripts to click buttons in Gerrit seems more
complicated than necessary when the url parameter should just work
across versions.
Change-Id: Ic5d139dc381f7bc53d57974e3f351b6932235cca
Clark Boylan
0eea942816