ci(doc): only run on releases

Author: mjossdev

.github/workflows/documentation.yaml

@@ -1,9 +1,7 @@
 name: Documentation
 on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
+  release:
+    types: [released]
 
 permissions:
   contents: read