Added github-actions reporter to vitest CI runs

[9larsons]

vitest's dot reporter writes its progress and its failure summary as one continuous single-line stream. GitHub Actions truncates long log lines, so when a vitest test fails in CI the summary block (⎯⎯ Failed Tests ⎯⎯, the test name, the assertion diff) gets cut off — the logs show the step exited 1, but not which test failed.

This adds the github-actions reporter alongside dot, gated on GITHUB_ACTIONS so local runs keep the compact dot-only output. The reporter emits inline ::error:: annotations pinned to the failing file and line, which surface directly on the job and the PR diff.

Found while debugging a unit-test failure on another PR, where the truncated log made it impossible to identify the failing test without reproducing the whole suite locally.

🤖 Generated with Claude Code

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 7d70fdf9-a1f2-4a5a-9645-92887326fe47

📥 Commits

Reviewing files that changed from the base of the PR and between 585cb3f and 543d05d.

📒 Files selected for processing (1)

• ghost/core/vitest.config.ts

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Walkthrough

This PR modifies the Vitest configuration in ghost/core/vitest.config.ts to dynamically select test reporters based on the GitHub Actions environment variable. When running in GitHub Actions CI, the configuration now includes both the dot and github-actions reporters; in other environments, it uses only the dot reporter. No other test execution or configuration settings were changed.

Possibly related PRs

• TryGhost/Ghost#27898: Modifies test.reporters setup in ghost/core/vitest.config.ts to configure test reporters.
• TryGhost/Ghost#27901: Adds a CI step that executes the test:vitest target, which will utilize the conditional reporter configuration.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and accurately summarizes the main change: adding the github-actions reporter to vitest CI runs.
Description check	✅ Passed	The description is clearly related to the changeset, explaining the motivation for adding the github-actions reporter to handle GitHub Actions log truncation issues.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch vitest-ci-reporter

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