workflows: Run "publish" when a release is published

We want the package to be published when the release is published, not
when it is created.

As workflows are not triggers on draft releases, if a release is first
saved as a draft, the workflow would not be triggered with "created".

.github/workflows/publish.yml

@@ -5,7 +5,7 @@ on:
       - 'develop'
 
   release:
-    types: [created]
+    types: [published]
 
   # Allows to run this workflow manually from the Actions tab
   workflow_dispatch: