test-bot: Set HOMEBREW_NO_RUBY_MACHO on Linux
test-bot: Set HOMEBREW_NO_RUBY_MACHO on Linux

rwhogg/brew,maxim-belkin/brew,maxim-belkin/brew,rwhogg/brew,Linuxbrew/brew,Linuxbrew/brew,Linuxbrew/brew,hanxue/linuxbrew,hanxue/linuxbrew,Linuxbrew/brew,rwhogg/brew,maxim-belkin/brew,hanxue/linuxbrew