AWS Amplify Pull-Request Previews currently only supports private GitHub repository. This amplify-preview-actions GitHub action enables the ability to deploy AWS Amplify Pull-Request Previews for your open source and public GitHub repository.
With this amplify-preview-actions GitHub action, you can define your own rule to deploy the Pull-Request branch to the AWS Amplify console app page for a preview. For example, you can setup a rule only a pull request is labeled with Ready for review and is assigned to a reviewer; and clean up the previews after the pull request is merged or closed.