Update trigger_doc_gen.yml

.github/workflows/trigger_doc_gen.yml

@@ -13,6 +13,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Empty action
+      - name: Send repository_dispatch
         run: |
+          curl -X POST -H "Accept: application/vnd.github.v3+json" \
+            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            https://api.github.com/repos/${{ github.repository }}/dispatches \
+            -d '{"event_type": "generate-doc"}'
           echo "Empty action triggering the generation of the documentation"