ci: add workflow to move closed issues to milestone

[Romuald Lemesle (RomuDeuxfois)]

No description provided.

[Filigran Automation (Filigran-Automation)]

🤖 [AI-generated]

Hey Romuald Lemesle (@RomuDeuxfois)! 👋 Thanks a lot for opening PR #154 — really appreciate you adding this automation! 🙏

I just had a quick look and I think the description could be enhanced a little to help reviewers get through it faster. I haven't changed anything in your description — just a gentle suggestion:

Area	What could help	Suggestion
Description	The body is currently empty	A short note on what the workflow does and why (e.g. it moves closed issues to the matching milestone, and when it triggers)
Linked issue	No related issue is referenced	Per our conventions every PR should be linked to an issue and the title should end with its reference, e.g. (#1234) — could you link the tracking issue?

💡 If helpful, the contribution conventions walk through what to include.

No rush at all — thanks again for contributing to the project! 🚀

[Copilot]

Pull request overview

Adds a GitHub Actions workflow to automatically move closed issues (and to allow manual testing via workflow_dispatch) into a configured milestone when they match specific labels.

Changes:

• Introduces .github/workflows/move-closed-issue-to-milestone.yml to trigger on issues: closed and on manual dispatch.
• Runs FiligranHQ/filigran-ci-tools/actions/move-closed-issue-to-milestone with configured source labels and a target milestone.

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