Releasing to a Linux-only Homebrew formula

[nikolay]

Describe the bug

$ brew readall
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/muesli/homebrew-tap/deckmaster.rb
formulae require at least a URL

The formula is generated with GoReleaser and does not target macOS. In such case, at least depends_on :linux should be added, but, regardless, it does not work due to the fact that macOS requires a url property, which is not defined on macOS.

To Reproduce

Steps to reproduce the behavior:

https://github.com/muesli/deckmaster/blob/master/.goreleaser.yml

Expected behavior

The generated formula should have depends_on :linux and handle gracefully when the tap, which may have formulas available on macOS, too, errors out due to unset url property.

Environment (please complete the following information):

• OS: mac
• OS version: macOS 11.0.1 Big Sur
• GoReleaser Version 0.146.0

[caarlos0]

can you check #1900?

[github-actions]

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