Bug#1003059: ITP: su-exec -- switch user and group id, setgroups and exec

[Matteo Chesi <d4lamar@storera.com>]

Package: wnpp
Severity: wishlist

* Package name : su-exec
  Version: 0.2, latest commit 2019-02-26
  Upstream Author : Natanael Copa <ncopa@alpinelinux.org>
* URL : https://github.com/ncopa/su-exec
* License : MIT
  Description : switch user and group id, setgroups and exec

This is an alternative to gosu written in C.

It is minimal and already present in alpine linux.
It would be useful to have it for container environments.