Re-add the step to build the gem

Author: pcothenet

.github/workflows/publish.yml

@@ -32,6 +32,9 @@ jobs:
         with:
           ruby-version: 3.4.3
 
+      - name: Build Gem
+        run: gem build -o patch_ruby.gem patch_ruby.gemspec
+
       - name: Install Ruby Dependencies
         run: bundle install