Configure to generate preview on push to Frontend

.github/workflows/firebase-hosting-merge.yml

@@ -6,7 +6,6 @@ name: Deploy to Firebase Hosting on push
   push:
     branches:
       - master
-      - Frontend
 jobs:
   build_and_deploy:
     runs-on: ubuntu-latest

.github/workflows/firebase-hosting-pull-request.yml

@@ -2,7 +2,14 @@
 # https://github.com/firebase/firebase-tools
 
 name: Deploy to Firebase Hosting on PR
-'on': pull_request
+'on': 
+  pull_request:
+    branches:
+      - master
+      - Frontend
+  push:
+    branches:
+      - Frontend
 jobs:
   build_and_preview:
     if: '${{ github.event.pull_request.head.repo.full_name == github.repository }}'