Add automated monthly release workflow

[Copilot]

Automates monthly release creation via GitHub Actions.

Changes

• Workflow: .github/workflows/monthly-release.yml
  • Scheduled: 1st of each month at 00:00 UTC (cron: '0 0 1 * *')
  • Manual trigger: workflow_dispatch for ad-hoc releases
  • Tag format: YYYY-MM-DD (matches existing release pattern)
  • Duplicate handling: Checks existence before creation
  • Uses GitHub CLI (gh release create) instead of deprecated actions/create-release@v1
  • Includes Zenodo record link to trigger automatic updates

Example Usage

# Automatic execution - no action required
# Manual trigger from Actions tab:
# Actions → Monthly Release → Run workflow

Release notes template: "Monthly release for {date}. This release was automatically created by GitHub Actions. This release triggers an update to the Zenodo record: https://zenodo.org/records/1169173"

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[seandavi]

Could you add to the release notes that an additional rationale for the release is to trigger a zenodo update to zenodo record: https://zenodo.org/records/1169173 and provide that link?

[Copilot]

Could you add to the release notes that an additional rationale for the release is to trigger a zenodo update to zenodo record: https://zenodo.org/records/1169173 and provide that link?

Added the Zenodo record link to the release notes. The releases will now include information about triggering the Zenodo update at https://zenodo.org/records/1169173 (commit 9085eb3)