ci: add ecosystem PR smoke lane

[ulises-jeremias]

Summary

This PR turns V Apps and Modules into a smaller PR smoke lane while preserving the current full ecosystem coverage for master pushes and scheduled runs.

• Add a nightly schedule for full ecosystem coverage.
• Keep the workflow name and existing job/check names unchanged.
• Keep these representative checks on PRs in v-apps-compile:
  • vab
  • gitly
  • v-analyzer
  • msgpack
• Run the heavier active ecosystem steps only outside pull_request events.
• Add read-only workflow permissions because the workflow only needs repository reads.

Fixes #27843.

Why

The full ecosystem workflow clones and builds many external projects. Keeping all of that on every PR increases latency and external-network flakiness. This keeps useful PR signal from a smaller representative set while moving the full set to master and nightly scheduled coverage.

Validation

• Parsed .github/workflows/v_apps_and_modules_compile_ci.yml with Ruby YAML.
• Ran git diff --check.
• Ran two AI code review passes; the first review found an implicit success() guard issue, and the follow-up review had no findings.

Local limitations:

• rtk prettier --check .github/workflows/v_apps_and_modules_compile_ci.yml could not run because Corepack fails with the known package signature/keyid error before invoking Prettier.
• actionlint is not installed locally.

Workflow Lint and GitHub Actions should provide final formatting and workflow validation in CI.

[ulises-jeremias]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 35ed87fc7b

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[medvednikov]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

Reviewed commit: 6daed5499a

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

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