After all the refactoring done so far, we can run checks directly
inside of `make`, because we have auto-cleanup, temporary environments
and we don't need wrapper scripts anymore.
Part of https://github.com/ooni/probe/issues/1466.
Part of https://github.com/ooni/probe/issues/1440.
Basically, let us continue to update our build infrastructure so that we can release v3.10.0-beta.
Now, it's the turn of iOS.