added GH action to delete GCP key

.github/workflows/revoke-gcp-key.yml

@@ -0,0 +1,25 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Revoke GCP Key
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Revoke Firebase Token
+      run: curl -H "Content-type:application/x-www-form-urlencoded" -s https://accounts.google.com/o/oauth2/revoke?token=${{secrets.GCP_SA_KEY}}