As the Multi-Arch CI engineer, I would like to track completion of z-stream testing for all supported releases on Z so that any issues can be detected in advance and fixed.

Acceptance Criteria:

• Weekly tests are executed on the tracking spreadsheet: https://docs.google.com/spreadsheets/d/1PuW0zyBg7moLIiXq8tQ0cFyz427NGx8R-cStv5Mt7ok/edit#gid=1099731938
• Bugs are reported in BZ