Is pulumi switching to multiple public alpha releases a day or is this just a blip as you're changing your release pipeline?
Looking at the Github release page, the first page is just alpha releases:
https://github.com/pulumi/pulumi/releases, you have to go to the 2nd page to get an official release. This makes it harder to read through recent changes and makes using Github's hidden RSS feed for releases very noisy. I'd ask whether these should be marked as official releases instead of just being tagged.
EDIT: No rush on answering this. It's late on a Friday and it is a holiday weekend in the US