Write client_secrets.json on build

.github/workflows/build_push.yml

@@ -40,6 +40,13 @@ jobs:
           path: app/google-services.json
           contents: ${{ secrets.GOOGLE_SERVICES_TEXT }}
           write-mode: overwrite
+
+      - name: Write client_secrets.json
+        uses: DamianReeves/write-file-action@v1.2
+        with:
+          path: app/src/main/assets/client_secrets.json
+          contents: ${{ secrets.CLIENT_SECRETS_TEXT }}
+          write-mode: overwrite
       # SY -->
 
       - name: Build app and run unit tests