ci: mirror the repository to GitLab

[jmrplens]

Same mirror workflow as gitlab-mcp-server: force-pushes branches and tags to gitlab.com/jmrp/TFG-TFM_EPS on every push (plus a 6h cron) and syncs GitHub releases to GitLab releases with asset links back to the canonical GitHub assets. Secrets GITLAB_MIRROR_SSH_KEY and GITLAB_API_TOKEN are already configured.

Summary by Sourcery

Mirror the repository and published releases to GitLab through an automated GitHub Actions workflow.

New Features:

• Add automated mirroring of all repository branches and tags from GitHub to GitLab on pushes, scheduled runs, and manual triggers.
• Synchronize published GitHub releases and their assets to linked GitLab releases.

Enhancements:

• Keep GitLab releases and asset links aligned with their canonical GitHub releases, including removal of stale links.

CI:

• Add a GitHub Actions workflow for force-pushing the repository mirror and syncing releases after successful release workflows.

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Reviewer's Guide

Adds a scheduled and event-driven GitHub Actions workflow that force-mirrors branches and tags to GitLab over authenticated SSH, and reconciles published GitHub releases and their assets into GitLab releases via API links.

Sequence diagram for repository mirroring

sequenceDiagram
    participant Trigger as GitHub event
    participant Actions as GitHub Actions
    participant GitHub as GitHub repository
    participant GitLab as GitLab repository

    Trigger->>Actions: Start GitLab Mirror
    Actions->>Actions: Configure GitLab SSH key
    Actions->>GitHub: git fetch --prune --tags
    GitHub-->>Actions: Branch and tag refs
    Actions->>GitLab: git push --force --prune branches and tags
    GitLab-->>Actions: Mirrored refs

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Sequence diagram for GitHub release synchronization

sequenceDiagram
    participant Trigger as Release or scheduled event
    participant Actions as GitHub Actions
    participant GitHub as GitHub Releases API
    participant GitLab as GitLab Releases API

    Trigger->>Actions: Start release synchronization
    Actions->>GitHub: gh api releases
    GitHub-->>Actions: Published releases and assets
    loop Each published release
        Actions->>GitHub: gh release view tag
        GitHub-->>Actions: Release metadata and asset URLs
        Actions->>GitLab: GET release by tag
        alt Release exists
            Actions->>GitLab: PUT release metadata
        else Release is missing
            Actions->>GitLab: POST release metadata
        end
        Actions->>GitLab: POST or PUT release asset links
        Actions->>GitLab: DELETE stale asset links
    end

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File-Level Changes

Change	Details	Files
Add an automated GitHub-to-GitLab repository mirror workflow.	Trigger mirroring on pushes, successful release workflow completions, a six-hour schedule, and manual dispatch. Fetch all GitHub branches and tags into a bare repository, then force-push and prune refs on GitLab. Configure the SSH key, pinned GitLab host key, repository URL, and concurrency controls.	.github/workflows/gitlab-mirror.yml
Synchronize published GitHub releases and assets as linked GitLab releases.	Use the GitHub CLI and GitLab API to create or update non-draft releases. Add links to the canonical GitHub release and each GitHub asset, preserving asset names and package link types. Remove stale or duplicate GitLab release asset links and validate the API token.	.github/workflows/gitlab-mirror.yml

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