ci: tweak the build script

.github/workflows/build.yml

@@ -89,6 +89,7 @@ jobs:
       with:
         upload_url: ${{ steps.create_release.outputs.upload_url }} # This pulls from the CREATE RELEASE step above, referencing it's ID to get its outputs object, which include a `upload_url`. See this blog post for more info: https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps
         asset_path: pkg/avocado-${{steps.gem_version.outputs.tag}}.gem
+        asset_name: avocado-${{steps.gem_version.outputs.tag}}.gem
         asset_content_type: application/x-tar
 
     - name: Delete draft release