This is a sandbox used by sioworkers' `ProotSandbox`.

It's goal is to separete execution in other sandboxes only to their directory.
It's done by 'chrooting' there using `proot` tool.

Used software:
* /bin/sh (busybox-static) |
* /lib/libtalloc*          |
* /lib/* (libc)            |-> from Debian buster packages
* /proot/proot -> built from PRoot fork available at https://github.com/matrach/PRoot

Special thanks to STMicroelectronics and PRoot developers.
For more details about proot see http://proot.me/

TODO: get rid of this and use sio2jail for compiling instead
