Skip homepage audit for www.gnu.org and www.nongnu.org on GitHub runners

[botantony]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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Related issue: Homebrew/homebrew-core#206757

There are a lot of formulae in the core repository that have www.gnu.org and www.nongnu.org homepages (grep -o -n "www\.gnu\.org" -r . | cut -d : -f 1 | uniq -c | wc -l gives 119 entries). Admins do not want to unblock GitHub infrastructure (https://savannah.nongnu.org/support/index.php?111187), so I think it would be better skip this check on Linux (this audit error doesn't occur on macs). If the homepage has a problem it'll be caught during tests on macOS

[Bo98]

Looks good but I'd make it conditional on ENV["HOMEBREW_GITHUB_HOSTED_RUNNER"] instead of the OS.

[botantony]

@Bo98 thanks for the feedback

I'll add ENV["HOMEBREW_GITHUB_HOSTED_RUNNER"] but keep it OS specific. brew audit passes the tests on macOS runners (I assume GNU admins didn't ban them because very few people use macOS in GitHub Actions) so we can keep it

If the homepage has a problem it'll be caught during tests on macOS

[Bo98]

Homebrew-core doesn't use GitHub-hosted macOS runners (except certain dependent tests) so I'm guessing you tried it out in a tap?

[botantony]

well, i completely forgot homebrew has their own self-hosted ci runners, guess your idea makes sense

[Bo98]

Thanks!