A release workflow

Scheduled job that detects release branches upstream then:

1. Creates a pr merging the base of said branch into `master`
2. Creates a release branch including the upstream release branch, and draft release on GitHub.
3. When the draft release is published pypi and docs are also published.

Also, when the version number changes, the release process is activated (for a bug fix release in a release branch)

Start by reviewing the repository’s existing CI and release configuration and how version changes are handled. The work is done when a scheduled process detects upstream release branches, creates the requested PR, release branch, and draft GitHub release, then publishes PyPI and documentation when the release is published.

Written by the indexing model from the issue text.