[#1241] Fix problem in passage.setup

[merks]

• Ensure that a proper API baseline is populated.
• Ensure that nested projects are imported.
• Configure forked branches to use rebase by default.

[merks]

It's hard to contribute to passage with problems in the setup. 😢

[ruspl-afed]

It's hard to contribute to passage with problems in the setup.

Sorry for this, Ed. And thank you so much for fixing it!

[ruspl-afed]

Thank you @merks