ci: queue integration tests so they don't race on the shared Plex server

[tablackburn]

Summary

• Add a job-level concurrency group to the integration-tests job so it never runs concurrently against the shared, live Plex server.
• group: ${{ github.workflow }}-integration (constant — not keyed by matrix.os or ref) → serializes the ubuntu + windows matrix legs of a run and integration across overlapping runs/PRs.
• cancel-in-progress: false → queue, never cancel an in-progress suite.
• Scoped to integration only; unit tests + lint stay parallel (they're deterministic — integration is the only flaky job, because it's the only one hitting an external service).

Why

PR #64's windows integration leg flaked on Collection ItemCount assertions while the ubuntu leg passed on the same commit — two jobs mutating the same Plex server at once. Queuing eliminates that race.

Notes

• This is PlexAutomationToolkit-specific: it's the only repo with an integration-tests job, so this does not belong in the template.
• GitHub allows one pending run per concurrency group; if integration runs from several commits pile up, an older pending one can be superseded — acceptable here (newest wins; a re-run recovers it).
• Touches CI.yaml, as does open PR fix: enforce PSScriptAnalyzer in the build and unify the lint ruleset #64 (different section) — whichever merges second takes a trivial rebase.

Test Plan

• CI green; integration jobs observed running one-at-a-time rather than in parallel

Summary by CodeRabbit

• Chores
  • Updated integration testing workflow configuration to prevent concurrent test runs and avoid interrupting in-progress executions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 22d28bad-c47b-406b-8de6-9bb7b0e9a240

📥 Commits

Reviewing files that changed from the base of the PR and between bb93bca and f03f3bf.

📒 Files selected for processing (1)

• .github/workflows/CI.yaml

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📝 Walkthrough

Walkthrough

This pull request adds a concurrency policy to the GitHub Actions integration-tests job to prevent concurrent execution. The shared live Plex server cannot handle simultaneous test runs, so the workflow now serializes integration test jobs across all matrix variations.

Changes

Integration Test Concurrency Policy

Layer / File(s)	Summary
Integration test job concurrency policy .github/workflows/CI.yaml	The integration-tests job defines a fixed concurrency group and sets cancel-in-progress: false to serialize runs and prevent concurrent access to the shared Plex server.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 One test at a time, that's the way,
No race conditions here, hooray!
Plex server shared, but not in strife—
Concurrency locks bring order to life! 🔒

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and specifically describes the main change: adding concurrency queuing to integration tests to prevent race conditions on a shared Plex server.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/queue-integration-tests

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[Copilot]

Pull request overview

Adds a job-level concurrency group to the integration-tests job in .github/workflows/CI.yaml so that integration runs against the shared live Plex server are serialized rather than racing in parallel across matrix legs and overlapping workflow runs.

Changes:

• Add concurrency block to integration-tests with a constant group (${{ github.workflow }}-integration) not keyed on matrix.os or ref.
• Set cancel-in-progress: false so an in-flight integration suite is never interrupted; newer runs queue.

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[tablackburn]

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[coderabbitai]

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