THROWAWAY: probe whether the e2e GKE cluster was deleted

Run 34356382122 was cancelled and the runner was killed four minutes into
`gcloud container clusters delete`. No human account has access to the
project, so list the clusters from CI, which does.

This branch and file are to be deleted once the answer is known.

Signed-off-by: Richard Wall <richard.wall@cyberark.com>

Author: wallrj-cyberark

.github/workflows/tmp-gke-cluster-probe.yaml

@@ -0,0 +1,46 @@
+# THROWAWAY. Lists GKE clusters in the e2e project to confirm whether the
+# cleanup step of run 34356382122 completed after the runner was killed
+# mid-delete. Delete this branch and file once the answer is known.
+name: tmp-gke-cluster-probe
+on:
+  push:
+    branches: [tmp-gke-cluster-probe]
+
+permissions:
+  contents: read
+  id-token: write
+
+jobs:
+  probe:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Authenticate to Google Cloud
+        uses: google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093 # v3.0.0
+        with:
+          credentials_json: '${{ secrets.GCP_SA_KEY }}'
+
+      - name: Set up gcloud
+        uses: google-github-actions/setup-gcloud@aa5489c8933f4cc7a4f7d45035b3b1440c9c10db # v3.0.1
+        with:
+          project_id: machineidentitysecurity-jsci-e
+
+      - name: List every cluster in the project
+        run: |
+          echo "=== all clusters, all locations ==="
+          gcloud container clusters list \
+            --project=machineidentitysecurity-jsci-e \
+            --format="table(name,location,status,createTime,currentNodeCount)"
+
+          echo
+          echo "=== does test-secretless-260909-132042 still exist? ==="
+          if gcloud container clusters list \
+               --project=machineidentitysecurity-jsci-e \
+               --filter="name=test-secretless-260909-132042" \
+               --format="value(name)" | grep -q .; then
+            echo "PRESENT: the cleanup did not complete"
+          else
+            echo "ABSENT: the cleanup completed"
+          fi