ci: Enable upgrade tests using ct

[onprem]

Signed-off-by: Prem Saraswat [email protected]

Description

As in title.

Type of change

What type of changes does your code introduce to tobs? Put an x in the box that apply.

• [ ] CHANGE (fix or feature that would cause existing functionality to not work as expected)
• [ ] FEATURE (non-breaking change which adds functionality)
• [ ] BUGFIX (non-breaking change which fixes an issue)
• [ ] ENHANCEMENT (non-breaking change which improves existing functionality)
• [x] NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

[onprem]

Waiting for #521 to get merged as it kind of touches the same files. Will rebase and mark this ready for review after #521 gets merged.