fixup! fixup! fixup! Update gorelease config and docs - moving to cask due to depreciation

.goreleaser.yaml

@@ -65,5 +65,7 @@ homebrew_casks:
     hooks:
       post:
         install: |
-          system_command "/usr/bin/xattr",
-                         args: ["-dr", "com.apple.quarantine", "#{staged_path}/kportal"]
+          if OS.mac?
+            system_command "/usr/bin/xattr",
+                           args: ["-dr", "com.apple.quarantine", "#{staged_path}/kportal"]
+          end