steam: Allow overriding privateTmp (#387186)

  extraBwrapArgs ? [ ], # extra arguments to pass to bubblewrap (real default is at usage site)

  extraArgs ? "", # arguments to always pass to steam

  extraEnv ? { }, # Environment variables to pass to Steam

  privateTmp ? true, # if the steam bubblewrap should isolate /tmp

}:

let

  steamEnv = { name, runScript, passthru ? {}, meta ? {} }:

  buildFHSEnv {

    inherit name runScript passthru meta;

    inherit name runScript passthru meta privateTmp;

    multiArch = true;

    includeClosures = true;

      ${extraProfile}

    '';

    privateTmp = true;

    inherit extraPreBwrapCmds;

    extraBwrapArgs = [