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.github/workflows/cleanup.yaml

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+# Copyright 2020 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: "Clean up deployment"
+on:
+  pull_request:
+    # run on pull requests targeting main
+    branches:
+      - main
+    types: closed
+    paths-ignore:
+      - '**/README.md'
+      - 'kustomize/**'
+      - '.github/workflows/kustomize-build-ci.yaml'
+      - 'terraform/**'
+      - '.github/workflows/terraform-validate-ci.yaml'
+jobs:
+  cleanup-namespace:
+    runs-on: [self-hosted, is-enabled]
+    steps:
+      - name: Delete PR namespace in staging cluster
+        if: ${{ always() }}
+        timeout-minutes: 20
+        run: |
+          gcloud container clusters get-credentials $PR_CLUSTER \
+              --region $REGION --project $PROJECT_ID
+          NAMESPACE="pr${PR_NUMBER}"
+          kubectl delete namespace $NAMESPACE
+        env:
+          PROJECT_ID: "online-boutique-ci"
+          PR_CLUSTER: "prs-gke-cluster"
+          REGION: "us-central1"
+          PR_NUMBER: ${{ github.event.number }}