fix: Updates release workflow to run when a PR is merged to main.

.github/workflows/release.yml

@@ -1,4 +1,4 @@
- # Copyright 2025 Google LLC
+# Copyright 2025 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,38 +15,40 @@
 name: Release
 
 on:
-  release:
-    types: [published]
+  pull_request:
+    types: [closed]
+    branches: [main]
 jobs:
-  release:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      id-token: write
-    env:
-      GOOGLE_MAPS_JS_SAMPLES_KEY: "${{ secrets.GOOGLE_MAPS_JS_SAMPLES_KEY }}"
-    steps:
-      - uses: actions/checkout@v3
-        with:
-          token: ${{ secrets.SYNCED_GITHUB_TOKEN_REPO }}
-      - uses: actions/cache@v3
-        with:
-          path: ~/.npm
-          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-node
-      - uses: actions/setup-node@v3
-        with:
-          node-version: '22.x'
-      - run: npm i
-      - run: npm run build-prod
+    release:
+      runs-on: ubuntu-latest
+      permissions:
+        contents: read
+        id-token: write
+      if: github.event.pull_request.merged == true
+      env:
+        GOOGLE_MAPS_JS_SAMPLES_KEY: "${{ secrets.GOOGLE_MAPS_JS_SAMPLES_KEY }}"
+      steps:
+        - uses: actions/checkout@v3
+          with:
+            token: ${{ secrets.GITHUB_TOKEN }}
+        - uses: actions/cache@v3
+          with:
+            path: ~/.npm
+            key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+            restore-keys: |
+              ${{ runner.os }}-node
+        - uses: actions/setup-node@v3
+          with:
+            node-version: '22.x'
+        - run: npm i
+        - run: npm run build-prod
 
-      - uses: google-github-actions/auth@v1
-        with:
-          credentials_json: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_KEY }}
+        - uses: google-github-actions/auth@v1
+          with:
+            credentials_json: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_KEY }}
 
-      - name: Install Firebase CLI
-        run: npm install -g firebase-tools
+        - name: Install Firebase CLI
+          run: npm install -g firebase-tools
 
-      - name: Deploy to Firebase Hosting
-        run: firebase deploy --only hosting
+        - name: Deploy to Firebase Hosting
+          run: firebase deploy --only hosting