Add Firebase Hosting GitHub Actions workflow

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

@@ -0,0 +1,20 @@
+# This file was auto-generated by the Firebase CLI
+# https://github.com/firebase/firebase-tools
+
+name: Deploy to Firebase Hosting on merge
+on:
+  push:
+    branches:
+      - main
+jobs:
+  build_and_deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: npm run build
+      - uses: FirebaseExtended/action-hosting-deploy@v0
+        with:
+          repoToken: ${{ secrets.GITHUB_TOKEN }}
+          firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_DRAW_A_DAY_BA256 }}
+          channelId: live
+          projectId: draw-a-day-ba256