[kixelated]

Ubuntu package downloads exhaust CI job budgets before the smoke tests can run. Remove Azure from the hosted image's existing apt mirror list in the smoke and external-relay jobs, retaining the Ubuntu archive and security mirrors for system and Playwright dependencies.

The delay reproduces on main: the Nix job spent 43m45s fetching 113 MB at 43.2 kB/s. In the later relay job, Ubuntu downloads ran at 52.1 kB/s while apt.moq.dev delivered 20 MB at 21.8 MB/s. Both ran in westus3; other regions downloaded the same dependencies in seconds. The logs identify the Azure mirror/path as the bottleneck, without distinguishing the mirror server from its network route. See also actions/runner-images#12949.

Validation:

• nix develop --command just check, explicit actionlint, and git diff --check pass.
• Cargo CI in westus3 passed end to end. System packages: 114 MB in 34s; Playwright packages: 25.9 MB in 5s.
• Apt CI also passed end to end. System packages: 114 MB in 26s; Playwright packages: 25.9 MB in 5s.
• Docker CI finished Ubuntu downloads in seconds, then hit the existing libmoq/moq-gst release-discovery failures addressed separately in moq-dev/smoke#62. Other jobs were still running when this evidence was recorded.

No retry counts or timeouts change. Independent of moq-dev/smoke#60.

(Written by GPT-6)

[coderabbitai]

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Reviewing files that changed from the base of the PR and between cd60b77 and c5ecce1.

📒 Files selected for processing: 2

• .github/actions/ubuntu-mirrors/action.yml
• .github/workflows/smoke.yml

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Walkthrough

The pull request adds a composite action that checks the Ubuntu mirror-list reference, removes Azure archive HTTP entries, requires a nonempty mirror list, and prints the result. The smoke job invokes the action on Linux runners. The relays job invokes it on its Ubuntu runner.

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to c5ecc

No concrete merge-blocking risk was found in the mirror filtering change.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main change: avoiding the slow Azure Ubuntu package mirror in CI.
Docstring Coverage		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		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description check		The pull request description directly explains the changes to remove the slow Azure Ubuntu mirror from smoke and external-relay jobs. It also documents the motivation, validation, and scope.

Full details: Docstring Coverage

Explanation

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 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches: 💡 1

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