Add "mirror" field to repo API

models/repo.go

@@ -281,6 +281,7 @@ func (repo *Repository) APIFormat(mode AccessMode) *api.Repository {
 		Description:   repo.Description,
 		Private:       repo.IsPrivate,
 		Fork:          repo.IsFork,
+		Mirror:        repo.IsMirror,
 		HTMLURL:       repo.HTMLURL(),
 		SSHURL:        cloneLink.SSH,
 		CloneURL:      cloneLink.HTTPS,