Enable debugging action

.github/workflows/mad_regenerate-models.yml

@@ -4,12 +4,18 @@ on:
   workflow_dispatch:
   schedule:
     - cron: "30 2 * * *"
+  pull_request:
+    branches:
+      - main
+    paths:
+      - ".github/workflows/mad_regenerate-models.yml"
 
 jobs:
   regenerate-models:
     runs-on: ubuntu-latest
     strategy:
       matrix:
+        # placeholder required for each axis, excluded below, replaced by the actual combinations (see include)
         slug: ["placeholder"]
         ref: ["placeholder"]
         include: