fix(cli): terminate github actions command files

[sidsri14]

Summary

Fixes #4003.

GitHub Actions command files (GITHUB_ENV and GITHUB_OUTPUT) expect each command entry to be newline-terminated. The CLI helper previously joined entries with newlines but did not terminate the final entry, which could let a later append concatenate onto the last output value.

This changes the helper to format command-file writes with a trailing platform line separator when there is at least one entry, while preserving empty writes as empty. It also adds a focused regression test for both env vars and outputs.

Validation

Passed:

• pnpm --filter trigger.dev exec vitest run src/utilities/githubActions.test.ts
• pnpm --filter trigger.dev exec vitest run src/utilities/colorMarkup.test.ts src/utilities/discoveryCheck.test.ts src/utilities/githubActions.test.ts
• pnpm --filter trigger.dev run typecheck
• pnpm --filter trigger.dev run build
• pnpm exec oxlint packages/cli-v3/src/utilities/githubActions.ts packages/cli-v3/src/utilities/githubActions.test.ts
• pnpm exec oxfmt --check packages/cli-v3/src/utilities/githubActions.ts packages/cli-v3/src/utilities/githubActions.test.ts
• git diff --check

Also ran pnpm --filter trigger.dev test -- --run after building local workspace dependencies. It still fails on unrelated existing issues in this Windows checkout:

• src/mcp/smoke.test.ts and src/mcp/tools.test.ts are executable smoke scripts with no Vitest suites.
• src/commands/skills.test.ts expects Windows backslash paths but receives normalized slash paths.
• src/entryPoints/managed/snapshot.test.ts increments handlerExecutionCount while the local variable is named _handlerExecutionCount.

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Latest commit: e598c5d

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[github-actions]

Hi @sidsri14, thanks for your interest in contributing!

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This PR will be closed automatically. See https://github.com/triggerdotdev/trigger.dev/blob/main/CONTRIBUTING.md for more details.

[coderabbitai]

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Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 88ca009 and e598c5d.

📒 Files selected for processing (2)

• packages/cli-v3/src/utilities/githubActions.test.ts
• packages/cli-v3/src/utilities/githubActions.ts

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Walkthrough

Updated GitHub Actions environment and output writing to use a shared formatter with platform-specific line separators and trailing separators for non-empty entries. Added Vitest coverage for newline-terminated writes, empty inputs, environment restoration, and temporary-file cleanup.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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