Merge pull request #12836 from carlocab/rosetta-cask-caveat

cask/dsl/caveats: add `:requires_rosetta`

Library/Homebrew/cask/dsl/caveats.rb

@@ -127,6 +127,17 @@ module Cask
         end
       end
 
+      caveat :requires_rosetta do
+        next unless Hardware::CPU.arm?
+
+        <<~EOS
+          #{@cask} is built for Intel macOS and so requires Rosetta 2 to be installed.
+          You can install Rosetta 2 with:
+            softwareupdate --install-rosetta --agree-to-license
+          Note that it is very difficult to remove Rosetta 2 once it is installed.
+        EOS
+      end
+
       caveat :logout do
         <<~EOS
           You must log out and log back in for the installation of #{@cask} to take effect.