Pulp

Extend the current release workflow in Github Actions. Change the trigger to a manual one[0][1] that takes a version argument (eg 3.11.0). This workflow should be idempotent so that if any step fails, it can be re-run.

This workflow will:

1. Check to ensure there is a corresponding milestone in redmine
2. Run the release script and push commits to master
3. Assign the issues from the release script to the milestone in redmine
4. Create a new tag and Github release
5. Run the rest of the steps of the current release workflow (which should publish pypi package, docs, etc)

[0] https://github.blog/changelog/2020-07-06-github-actions-manual-triggers-with-workflow_dispatch/

[1] https://docs.github.com/en/actions/managing-workflow-runs/manually-running-a-workflow