[Infra] Test FDL's FTL workflow job

Author: ncooke3

.github/workflows/dynamiclinks.yml

@@ -141,7 +141,7 @@ jobs:
 
   quickstart-ftl-cron-only:
     # Don't run on private repo.
-    if: github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule'
+    if: github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule' || github.event_name == 'pull_request'
 
     env:
       plist_secret: ${{ secrets.GHASecretsGPGPassphrase1 }}