{environment,nix-tools}: correct default $PATH ordering to match macOS

[emilazy]

No description provided.

[Samasaur1]

confirmed that this is the PATH ordering that macOS uses on macOS 12, 14, and 15 (contents of /etc/paths).

I do see that at least on macOS 14 and above, there's also a /System/Cryptexes/App/usr/bin directory in PATH. Do we want to include this directory in the default PATH as well?

/usr/local/bin
/System/Cryptexes/App/usr/bin
/usr/bin
/bin
/usr/sbin
/sbin

(contents of /etc/paths on macOS 14.7)

[emilazy]

Yeah, plausibly. I think if they put out a rapid security response update that fixed a vulnerability in /usr/bin or something the replacement would go there? I’m not sure. There’s also more stuff in /etc/paths.d/10-cryptex and /etc/paths.d/100-rvictl that gets added by default. Adding those seems like a reasonable idea, just not one I’m as certain about as this change. (But I’d probably approve a PR to do so.)

[Enzime]

LGTM

Did you run into an issue with the ordering?

[emilazy]

Nah, I was just checking it against a stock installation while doing other work on these files and noticed the discrepancy.