Run CI once per change instead of twice

[MrTig-afk]

on: push: had no branch filter, so a PR branch matched both push and pull_request and ran the entire suite twice on every push. Visible as fail=2 on #47, #48 and #49: two identical backend runs, two failure emails each.

Limits the push trigger to main. PR branches now run once via pull_request, main runs once via push. Halves CI minutes and email volume, no loss of coverage.

Summary by CodeRabbit

• Chores
  • Continuous integration workflows now run on pushes to the main branch. Pull request checks remain unchanged.

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Project	Deployment	Actions	Updated
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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Team

Run ID: 68d5627e-8f0c-42ba-a12f-901a7c5f7bad

📥 Commits

Reviewing files that changed from the base of the PR and between 268ae22 and c7781a1.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

Included review availability: Your plan provides up to 8 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The CI workflow now triggers on pushes to main only. Pull request triggers remain unchanged.

Changes

CI trigger configuration

Layer / File(s)	Summary
Restrict push-triggered CI runs .github/workflows/ci.yml	The push trigger now applies only to the main branch. The pull_request trigger remains unchanged.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to c7781

This change limits CI push runs to main so pull requests run once instead of twice, reducing duplicate CI work and notifications without a demonstrated coverage regression; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 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 clearly describes the main change: preventing duplicate CI runs so each change runs CI once. It is concise and specific.
Docstring Coverage	✅ Passed	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	✅ 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.

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. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/ci-single-trigger

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