Fix Firebase authentication with consistent credential paths

- Use runner.temp directory for credential file
- Ensure GOOGLE_APPLICATION_CREDENTIALS points to correct location
- Simplify deployment process with manual Firebase CLI

Author: cursoragent

.github/workflows/deploy.yml

@@ -25,10 +25,16 @@ jobs:
       - name: Build Astro site
         run: npm run build
 
-      - name: Deploy to Firebase
-        uses: FirebaseExtended/action-hosting-deploy@v0
-        with:
-          repoToken: '${{ secrets.GITHUB_TOKEN }}'
-          firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT }}'
-          channelId: live
-          projectId: notifuse
+      - name: Setup Firebase credentials
+        run: |
+          echo "$FIREBASE_SERVICE_ACCOUNT" > ${{ runner.temp }}/gcloud-key.json
+        env:
+          FIREBASE_SERVICE_ACCOUNT: ${{ secrets.FIREBASE_SERVICE_ACCOUNT }}
+      
+      - name: Install Firebase CLI
+        run: npm install -g firebase-tools
+      
+      - name: Deploy to Firebase Hosting
+        run: firebase deploy --only hosting --non-interactive --project notifuse
+        env:
+          GOOGLE_APPLICATION_CREDENTIALS: ${{ runner.temp }}/gcloud-key.json