run workflow on lael

Author: amanmahajan7

.github/workflows/update-screenshots.yml

@@ -1,7 +1,8 @@
 name: Update Visual Regression Screenshots
 
 on:
-  workflow_dispatch: # manual trigger only
+  pull_request:
+    types: [labeled]
 
 env:
   AUTHOR_NAME: 'github-actions[bot]'
@@ -13,6 +14,7 @@ env:
 
 jobs:
   update-screenshots:
+    if: ${{ github.event.label.name == 'Update Screenshots' }}
     runs-on: ubuntu-latest
 
     # don't run on main