fix: prevent Zerops runner VPN database timeouts

[BleedingDev]

Why the change

Reduce the native Zerops runner VPN MTU so deployment can read the complete Application Composition authority row without a transport timeout.

Special things to note

• This changes only the runner VPN, using Zerops' documented MTU 1350.
• The unchanged native PostgreSQL probe times out on the full 14.5 KB row at the default MTU and passes at MTU 1350; it also passes inside Zerops.
• Validation: 38 workflow tests, native hooks, workflow lint, and the exact runner query probe; application code and retained releases are unchanged.

Change outline

 Zerops runner connects to the private database
- zcli vpn up --project-id "$VPN_PROJECT_ID"
+ zcli vpn up --project-id "$VPN_PROJECT_ID" --mtu 1350
   → read the complete authority row
   → publish the approved composition
   → activate the retained Shell ingress

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
.github/actions/zerops-vpn/action.yml	0% smaller
app/scripts/tests/ci-workflows.test.mts	0% smaller

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Walkthrough

The Zerops VPN action now passes --mtu 1350 to vpn up. Other action behaviour is unchanged.

Changes

VPN connection

Layer / File(s)	Summary
Set the connection MTU .github/actions/zerops-vpn/action.yml	The connection command now passes --mtu 1350 to vpn up.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to 5be19

The VPN change leaves a CI test failing. Update its expected command before merging.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 5be19

The change adjusts packet sizing without changing the VPN project, credentials, or cleanup controls. No security regression was identified in the inspected paths, but the command-level test still expects the old invocation and deployment behavior at the new MTU has not been independently verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The changed configuration applies to runners using this action and their existing selected-project VPN connections. No authority expansion was found in the inspected command or callers; this does not establish coverage of external consumers or every deployment environment.

Trust Boundaries and Controls

• inferred — The change can restore transport reachability for existing database and deployment operations, but it does not itself supply new authority or remove the inspected connection-verification and workflow-ordering controls.

Resilience and Maintainability Implications

• observed — Cleanup outputs are prepared before connection. Inspected callers retain always-run cleanup, while the action checks state ownership, attempts native clear and conditional down, checks interface removal, deletes owned local state, and reports failures. These controls predate the MTU change; they do not prove recovery after abrupt runner termination or concurrent native sessions.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and clearly describes the VPN change’s intended purpose: preventing database timeouts on Zerops runners.

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Actionable comments posted: 1

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Inline comments:
Review comments at @.github/actions/zerops-vpn/action.yml:
- Line 81: Update the expected VPN command in the workflow test assertion to
include the `--mtu 1350` argument, matching the command recorded by the `vpn up`
action.

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ℹ️ Review info

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• Review profile: ASSERTIVE
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• Run ID: 33cafb68-b89a-4510-8c50-bf0a984a41e2

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• .github/actions/zerops-vpn/action.yml

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