chore: remove on-child-update sync workflow

[mateodelnorte]

Summary

Removes .github/workflows/on-child-update.yml entirely.

Why

These sync PRs create empty commits (--allow-empty) on every child repo push to main. The parent meta repo doesn't build or test child repos — it's a workspace coordinator. The empty commits are pure noise and trigger release-please unnecessarily.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Removed the automated child repository synchronization workflow that previously managed pull request creation for child repository updates.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3119ae5e-1e89-4669-9918-fb07829ab00c

📥 Commits

Reviewing files that changed from the base of the PR and between d978541 and 619a05f.

📒 Files selected for processing (1)

• .github/workflows/on-child-update.yml

💤 Files with no reviewable changes (1)

• .github/workflows/on-child-update.yml

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Walkthrough

The entire .github/workflows/on-child-update.yml GitHub Actions workflow file was removed. This workflow previously listened for repository dispatch events to synchronize child repository changes, automatically creating branches and pull requests with auto-merge capabilities.

Changes

Cohort / File(s)	Summary
GitHub Workflows .github/workflows/on-child-update.yml	Entire workflow deleted. Previously handled child repository synchronization logic including branch creation, PR management with auto-merge, and race condition handling via concurrency control.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• fix: use PR-based sync instead of direct push to protected main #44: Also modifies the same on-child-update.yml workflow file and touches the sync/PR creation logic
• fix(ci): always create sync commit for child repo updates #35: Alters the same child-repo sync workflow to modify commit creation behavior
• fix: use PARENT_REPO_PAT for sync commits to protected main #42: Changes the same workflow by modifying checkout secret configuration

Poem

🐰 A workflow once lived, so automated and spry,
Syncing child repos with a dutiful sigh,
But now it's removed—farewell, dear routine!
Simpler flows ahead for the garden scene! 🌿

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: removal of the on-child-update workflow file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/remove-child-sync-prs

---

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

[greptile-apps]

Greptile Summary

This PR removes .github/workflows/on-child-update.yml, a workflow that listened for repository_dispatch events from child repos and responded by creating a branch, making an --allow-empty commit, opening a PR, and auto-merging it into main. Because on-push-main.yml runs release-please on every push to main, these empty commits were causing spurious release PRs with no actual changes.

• The deletion is safe: no remaining workflow (ci.yml, on-push-main.yml, release.yml) references or depends on this workflow.
• Child repos that still dispatch child-repo-updated events will simply receive a 204 No Content from GitHub — the event is silently ignored, no errors are surfaced on the child side.
• The PARENT_REPO_PAT secret used exclusively by this workflow is now unused in the meta repo and can be cleaned up from repository settings as a follow-up.

Confidence Score: 5/5

• Safe to merge — removes a single workflow file with no impact on remaining CI/CD pipelines.
• This is a pure deletion of a self-contained workflow. No other workflow depends on it, the removal stops the noisy empty-commit pattern, and child repos that still dispatch the event will receive a harmless 204 response from GitHub. There are no logic errors, no missing updates to dependent files, and no risk of regression.
• No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/on-child-update.yml	Entirely removes the child-repo sync workflow that was creating empty commits on every child push to main, which was triggering release-please unnecessarily. Deletion is clean with no dependencies from remaining workflows.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Child Repo push to main] -->|repository_dispatch child-repo-updated| B{on-child-update.yml}
    B -->|REMOVED by this PR| C[Create sync/repo/sha branch]
    C --> D[git commit --allow-empty]
    D --> E[gh pr create]
    E --> F[Auto-merge PR]
    F --> G[Empty commit lands on meta/main]
    G --> H[on-push-main.yml triggers]
    H --> I[release-please runs unnecessarily]

    A2[Child Repo push to main] -->|repository_dispatch child-repo-updated| B2{No workflow listens}
    B2 -->|GitHub returns 204 No Content| C2[Event silently ignored ✅]

    style B fill:#ffcccc,stroke:#cc0000
    style C fill:#ffcccc,stroke:#cc0000
    style D fill:#ffcccc,stroke:#cc0000
    style E fill:#ffcccc,stroke:#cc0000
    style F fill:#ffcccc,stroke:#cc0000
    style G fill:#ffcccc,stroke:#cc0000
    style I fill:#ffcccc,stroke:#cc0000
    style B2 fill:#ccffcc,stroke:#00aa00
    style C2 fill:#ccffcc,stroke:#00aa00

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_{Reviews (1): Last reviewed commit: "chore: remove on-child-update workflow" | Re-trigger Greptile}