Ignore runner labels in actionlint

[shivammathur]

• 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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This PR adds an ignore flag to actionlint to ignore GitHub Actions runner labels.

[Bo98]

This is very Homebrew-specific naming and I don't think it makes sense for third-party taps to be mandated to match one of these.

homebrew-large-bottle-build is already deprecated and linux-self-hosted-1 will be soon be replaced with a new name.

I'd probably be OK disabling the check entirely tbh, or certainly at least for third-party taps. Should be possible to dynamically pass -ignore values in style.rb.

[MikeMcQuaid]

I'd probably be OK disabling the check entirely tbh

Me too, let's not bother being different for third-party taps here, it's not a useful check for the Homebrew ecosystem. @shivammathur you should be able to pass another -ignore, shout if you need help here!

[shivammathur]

@Bo98 @MikeMcQuaid I have updated the PR.

[MikeMcQuaid]

Thanks again @shivammathur, great work!