Your builds fail during the Install Missing Android SDK Step with the following error message in your build logs:
Failed to ensure android components, error: output: Configuration on demand is an incubating feature.FAILURE: Build failed with an exception.
You should also see a lot of following errors that mention this:
Could not get resource 'https://jcenter.bintray.com/
This is most likely due to an outage with the source, jcenter. You can monitor their status here: https://status.bintray.com/