chore(deps): update oss/v2/open-policy-agent/gatekeeper docker tag to v3.20.1-12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
oss/v2/open-policy-agent/gatekeeper	v3.20.1-4	patch	v3.20.1-6 → v3.20.1-12

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[aks-node-assistant]

🕵️ AgentBaker Linux Gate Detective — RCA for build 167734976

Pipeline: AKS Linux VHD Build - PR check-in gate (def 119535) · Failed job: Run AgentBaker E2E (Stage e2e, exit code 1)

TL;DR

• Classification: test-infra flake on shared E2E cluster — NOT caused by this PR.
• Confidence: High.
• Recommended action: Re-run the gate. No code change required in this PR.

Failure signature

• Wiki signature ID: kubenet-v5-node-not-ready-scriptless
• Pattern: kube.go:195 — 🔴 FAIL: "<vmss>" haven't appeared in k8s API server: context deadline exceeded after the 600s WaitForNodeReady budget; preceded by kube.go:166: error listing nodes: client rate limiter Wait returned an error: context deadline exceeded.
• Affected shared cluster (dominant): abe2e-kubenet-v5-150ee in abe2e-westus3.
• Blast radius: 115 / 152 failed tests (≈76%) match this exact signature; 97 of them on the single abe2e-kubenet-v5-150ee cluster. Failures span Ubuntu 22.04 / 24.04 / AzureLinuxV3 / ACL / both scriptless and script-based — i.e. orthogonal to image and scenario.

3-level RCA

1. Surface — VMSS create + SSH succeed (~140s, VM reaches running state). The Go test client then polls the AKS apiserver for the new node and times out at 600s. Test framework's API client also reports rate-limiter context deadline exceeded, suggesting apiserver throttling/overload on the shared cluster.
2. Corroboration — same exact signature on the same cluster across unrelated test files / OSes / kubelet configs. ~15 other failures hit other shared clusters (abe2e-latest-kubernetes-version, abe2e-azure-networkisolated-v3, abe2e-azure-network-v4, etc.) with the same kube.go:195 pattern. The remaining 37 failures are heterogeneous (e.g. Test_Ubuntu2404_VHDCaching missing /etc/containerd/config.toml, EntraIDSSH PubkeyAuthentication check, ChronyRestarts_Scriptless env-var diff) and are not the dominant signature.
3. Challenge — the PR is a Renovate bump of the OPA Gatekeeper container tag (v3.20.1-12) in components.json. Nothing in this diff touches kubelet, CNI, kubenet, node bootstrap, or the apiserver path. No plausible mechanism by which the bump can cause "node never registers in API server". Strongest competing theory (degraded shared cluster state / apiserver overload on abe2e-kubenet-v5-150ee) is fully consistent with the observed cross-scenario blast pattern.

Build-vs-test classification

Test infrastructure (shared cluster). Not a build/VHD/CSE regression.

Strongest remaining alternative

The cluster is not just flaky but actually degraded and needs recreate/cleanup — recurrence count rising suggests this is no longer a one-off.

⚠️ Wiki escalation

This build is the 7th distinct observation of kubenet-v5-node-not-ready-scriptless — crosses the > 6 distinct builds repair-item threshold defined in the wiki contract. A repair item should be opened by the Node Lifecycle SIG to investigate abe2e-kubenet-v5-150ee health.

This comment was posted automatically by the AgentBaker Linux Gate Detective Watcher. No raw logs or secrets are included.