This commit introduces a new GitHub Actions workflow to automate the
monthly release process using Calendar Versioning (CalVer).
The workflow:
- Runs automatically at 00:00 UTC on the 1st day of every month.
- Supports manual execution via `workflow_dispatch`.
- Automatically generates a CalVer tag (e.g., vYYYY.MM.0).
- Employs the GitHub CLI to create a release and auto-generate
release notes based on merged pull requests.
Jonathan Hui