Currently after commit has been built, comment is added to the commit telling whether build was successful or not. For pull requests build no feedback is given at all (not even comment).

It would be much better if BitBucket Build Status API (https://blog.bitbucket.org/2015/11/18/introducing-the-build-status-api-for-bitbucket-cloud/) would be used for defining that commit or pull request build is either INPROGRESS, SUCCESSFUL or FAILED.