add workflow_dispatch

Author: dario-coscia

.github/workflows/export_tutorials.yml

@@ -6,6 +6,9 @@ on:
       - "**"  # Run on push on all branches
     paths:
       - 'tutorials/**/*.ipynb'
+  workflow_dispatch:
+    branches:
+    - "**"  # Run on push on all branches
 jobs:
   export_tutorials:
     permissions: write-all