Issue:
Your tag triggers are not starting any builds. When you go to your git repository's Webhooks menu to look for responses to your trigger, you see this error:
{"error":"Failed to transform the webhook: Unsupported GitHub Webhook event: create"}
Possible solutions:
Bitrise only supports Push and Pull Request events. To get the webhook work, you have to uncheck the Branch and Tag Creation option in the available webhook event list in the Webhooks menu of your git provider, for example, GitHub.
Once that's done, tags should work in Bitrise with the Push option.