type vcsCacheKey struct {
	vcs    string
	remote string
}

func NewRepo(ctx context.Context, vcs, remote string) (Repo, error) {
	return vcsRepoCache.Do(vcsCacheKey{vcs, remote}, func() (Repo, error) {
		repo, err := newVCSRepo(ctx, vcs, remote)
		if err != nil {
			return nil, &VCSError{err}
		}
		return repo, nil
	})
}

var vcsRepoCache par.ErrCache[vcsCacheKey, Repo]

type vcsRepo struct {