Tests are leaving empty temp dirs around on Linux

[john-science]

After the unit tests run (even if they pass successfully, empty temp dirs are being left around:

$ ls ~/.armi/
0wg1-2024071536823796283756293752/
0wg1-2024071536823796283326236423/
0wg2-2024071536823796226263623623/
0wg2-2024071536823796283756623623/

I imagine this is happening due to some logic not working on Linux in TemporaryDirectoryChanger.

NOTE: I can reproduce this bug on various Linux distros, but not on Windows.

[ntouran]

Those kinds of files can be left around when a test fails and the cleanup steps don't work. There is a big platform-dependent difference between how cleanup gets triggered after ctrl-c aborts based on signals which may be causing this:

armi/armi/__init__.py

Lines 350 to 352 in d0092e8

	if os.name == "nt":
	signal.signal(signal.SIGBREAK, _cleanupOnCancel)
	signal.signal(signal.SIGINT, _cleanupOnCancel)

Contextual sidenote: the ~/.armi dir is made in $HOME on linux (aka ~), but it should be identically made in Windows, generally in %USERPROFILE%, which I think is more like C:\users\[username]\AppData\armi or something like that.