mako: add testbed

[mateusauler]

Things done

• [x] Tested locally
• [x] Tested in testbed
• [x] Commit message follows commit convention
• [x] Fits style guide
• [x] Respects license of any existing code used

Notify maintainers

[mateusauler]

Since #1222 is taking a while, I think we can merge this one and refactor the testbed inside #1222 itself or in another PR afterwards.

[stylix-automation[bot]]

Successfully created backport PR for release-25.05:

• #1594