Some kind of CI check for targeting the `staging` branch

[jamesmunns]

So, I recently stepped on multiple rakes by not noticing PRs were targeting staging (a bors branch) and not main.

Is there any way we could make this a CI check, so we get a red X or something for the PRs, but also don't interfere with bors?

Sorry again for the noise, hoping to save the next person the same embarrassment.

[therealprof]

Hm, not sure from the top of my head. Maybe someone has an idea?