* Use MirrorID instead of RepoID
- Use the MirrorID as index(SQL uses `id` column not the `repo_id`).
Passes the Mirror ID's into the Sync functions.
* Check for MirrorID == 0
* Fix `StartToMirror` + refactor
* Update services/mirror/mirror.go
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>