Usage with private bitbucket repository

I have a private bitbucket repo and I was trying to figure out how I can use `auto` with my project but I got lost and didn't find the answer.
Anyways, my project is C++ project and we have already implemented CI/CD for it using GCP cloud build and docker. Can use any tool to generate release notes based on PRs between branches?

Start by clarifying how `auto` is expected to work with a private Bitbucket repository and whether release notes should be generated from pull requests between branches. Review the existing release-notes workflow alongside the project's GCP Cloud Build and Docker setup; done requires a documented, tested usage path, but no file or test is identified in the issue.

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