Allow isolated writable mount of /tmp in sandbox

What variant of Codex are you using?

IDE Extension

What feature would you like to see?

I'd like an option to isolated writable mount of /tmp in sandbox, for example sandbox_workspace_write.isolate_slash_tmp.

Additional information

My use case is GNU Make's POSIX jobserver on Linux: https://www.gnu.org/software/make/manual/html_node/POSIX-Jobserver.html
It creates /tmp/GMfifo<PID>, but since bubblewrap creates a PID namespace, the PID can collide and break the jobserver, requiring a fallback to the pipe jobserver and breaks parallel builds for some Make users.