docs(e2e): manual E2E/Run for release cherry-pick PRs

[yasserfaraazkhan]

Summary

• Decision: Do not auto-apply E2E/Run for cherry-pick PRs (or other PRs targeting release-*). E2E stays opt-in via a manual E2E/Run label.
• Auto E2E remains for PRs against main and for release E2E on build-release-* pushes (existing Matterwick flows).
• Rationale: each mobile E2E holds five cloud installs; auto-running on every release cherry-pick batch overloads provisioning (409s / failed dispatches).
• Release-* PRs are normal PRs for Matterwick (ref=<PR head>). For manual E2E/Run to succeed, the release line must have current E2E CI (five-server inputs + e2e-test/* statuses) — tracked as a separate release backport, not a Matterwick special-case.
• We are investigating cloud provisioning improvements (retries, shorter PR server TTL, clearer failure alerts) for high create-demand.

Test plan

• Confirm cherry-pick / release-* PRs do not get E2E/Run on open/sync
• Confirm manual E2E/Run still triggers Matterwick the same way as on main PRs
• Confirm main PRs still auto-label as today

[mm-cloud-bot]

@yasserfaraazkhan: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

Details

I understand the commands that are listed here

[coderabbitai]

📝 Walkthrough

Walkthrough

The change documents branch-specific E2E trigger ownership and execution rules. It also adds stable run names and changes concurrency groups to use the pull request number or tested commit SHA.

Changes

E2E trigger and workflow execution

Layer / File(s)	Summary
Run naming and concurrency grouping .github/workflows/e2e-detox-pr.yml	The workflow documents dispatch and commit selection rules. Run names use the pull request number or tested mobile version. Concurrency groups use the pull request number or MOBILE_VERSION.
Branch-specific trigger policy .github/workflows/e2e-label-manager.yml, detox/CLAUDE.md	Documentation limits automatic E2E/Run labelling to pull requests targeting main. Release and other non-main pull requests require manual opt-in. The documentation records five-installation provisioning limits and release-branch dispatch behaviour.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• mattermost/mattermost-mobile#9969: Restructures the same E2E workflow and changes its orchestration.
• mattermost/mattermost-mobile#9975: Updates E2E workflow concurrency and label-manager behaviour.
• mattermost/mattermost-mobile#9996: Changes concurrency handling in the same E2E workflow.

🚥 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.
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.
Title check	✅ Passed	The title clearly describes the documented manual E2E/Run behaviour for release cherry-pick pull requests.
Description check	✅ Passed	The description directly explains the E2E labelling decision, rationale, affected workflows, and test plan.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/e2e-manual-release-cherry-pick

---

_{Comment @coderabbitai help to get the list of available commands.}

[github-actions]

Coverage Comparison Report

Generated on August 04, 2026 at 09:35:01 UTC

+-----------------+------------+------------+-----------+
| Metric          | Main       | This PR    | Diff      |
+-----------------+------------+------------+-----------+
| Lines           |     88.15% |     88.15% |     0.00% |
| Statements      |     88.02% |     88.02% |     0.00% |
| Branches        |     76.96% |     76.96% |     0.00% |
| Functions       |     87.48% |     87.48% |     0.00% |
+-----------------+------------+------------+-----------+
| Total           |     85.15% |     85.15% |     0.00% |
+-----------------+------------+------------+-----------+