Apparently, there is no movement, even though as you can see people are asking for this loud and clear, and the issue is 7 years old at this point. I’ve re-opened this thread so we can keep you up to date if there is any movement on this, but, to the best of my current knowledge, until BitBucket unblocks us, there isn’t much we can do. Sorry we don’t have better news.
In the good news department, today we finally worked around that missing feature at bitbucket, and we now support builds for PR’s from bitbucket! I’ll update the support guide to mention this, but also wanted to send a message for anyone who is just watching the replies on this thread.