fix porter.rb file in release

.github/workflows/release.yaml

@@ -416,9 +416,10 @@ jobs:
       - name: Create and commit porter.rb file
         run: |
           sha=$(cat ./release/darwin/porter_${{steps.tag_name.outputs.tag}}_Darwin_x86_64.zip | openssl sha256 | sed 's/(stdin)= //g')
-          
+
           cat >porter.rb <<EOL
-          homepage "https://porter.run"
+          class Porter < Formula
+            homepage "https://porter.run"
             version "${{steps.tag_name.outputs.tag}}"
           
             on_macos do