Is there a way to activate pre-release builds (activating them for beta testing) without having to go to iTunes Connect's dashboard and manually activating them?
Every time I have a new build I have to go there, click on the app, click on pre-release and click the toggle. Being able to do it via terminal would fix my problem.
The old testflight didn't had this, i.e. builds were available right after you uploaded them.
Edit: I was expecting a solution that wouldn't require third party tools. However it seems like using fastlane is indeed the best solution. I may mark that answer correct, but I need to try that out first.
You can use the fantastic deliver tool. It supports both uploading a new build and activating it for pre-release testing (aka Apple TestFlight beta testing).