fix(infrastructure): use correct runner

.github/workflows/url_generator.yml

@@ -10,10 +10,14 @@ on:
         description: 'PR number (required when mode=pr)'
         required: false
         type: string
+      runner:
+        description: 'Runner to use (default: ubuntu-latest)'
+        required: false
+        type: string
 
 jobs:
   get_urls:
-    runs-on: ubuntu-latest
+    runs-on: ${{inputs.runner || 'ubuntu-latest'}}
     outputs:
       backend_url: ${{ steps.urls.outputs.backend_url }}
       frontend_url: ${{ steps.urls.outputs.frontend_url }}